4L80E
Part #
Reference #
Repair kits
Qty
OH 4L80E 97-up w/o pistons Transtec
- Part #
- DP2436
- Reference #
- 34002EB
- Extra information
OH 4L80E 97-up w/o pistons Precision
- Part #
- NK34900FX-MD
- Reference #
- 34002EB
- Extra information
Shift Correction 4L80E Superior
- Part #
- K4L80-E
- Reference #
- 34165
- Extra information
-
4L80E Kit (Superior K4L80-E) Shift Correction Package This valve body kit deals with these problems:
• Runaway high pressure
• Erratic pressure rise
• Converter lock-up shudder
• Inconsistent shift feel
• Shift solenoid filter blow-out
• Premature unit failure
• Fits 91-10
1. The Superior 4L80-E valve body kit offers the option of regular and heavy duty applications in the same package.
2. A complete pressure regulator valve train is supplied in the 4L80-E kit.
3. Failsafe, runaway high pressure will crack the case. The PR valve train supplied in this Shift Correction Package will stop runaway high pressure before it happens.
Shift Kit 4L80E Transgo
- Part #
- K34908E
- Reference #
- 34165
- Extra information
- Fits General Motors 4L80E, 4L85E, 1991-2009 Includes New Boost Valve assembly, High Pressure Relief assembly, Stronger better design Solenoid filter, Case to Center Support seals, 4th clutch strong bolt and other items which improve overall drivability and durability. Addresses High pressure parts breakage; direct clutch burn up; soft 2-3 slide-bang 1-2; low pressure due to solenoid filter breakup. Missing shifts with no diagnostic codes. Convenient drop in valves, No special tooling or machining necessary! Installation recommendation: Experienced technician Transmission removal necessary: No
Sure Cure 4L80E
- Part #
- SC-4L80E
- Reference #
- 34165
- Extra information
Sure Cure 4L80E
• Boost Valve Kit
• Case Bushing
• TCC Shift Valve O-Ringed End Plug Kit
• TCC Valve End Plug
• PR Valve End Plugs (2)
• Actuator Feed Limit Valve Kit
• TCC Regulator Valve Kit
• 1-2 & 2-3 Shift Valve Spring Kit
• Checkballs (8)
• Stator Support Bushing
• Selective Washer
• Front Unit Endplay Shim
• Restore shift quality and reduce comebacks
• Repairs biggest trouble areas to reduce comebacks
• Includes step-by-step instructions for comprehensive valve/pump body restoration
• Get everything you need for restoring troublesome units in one place, at one cost
Symptoms: • 2-3 Neutral • 2nd Gear starts • 3-4 Neutral • Band failure • Broken parts due to excessive line pressure • Burnt converter • Bushing "walks out" • Buzzing noise • Case damage • Clutch failure • Converter shudder • High line pressure • Metal contamination • No 4th • Output shaft & case damage • Solenoid codes • TCC apply & release concerns • TCC slip codes • Uncontrollable line rise • Wrong gear starts Correction:
The parts in this Sure Cure kit repair and restore key areas most prone to TCC-related transmission problems and other issues affecting shift quality.
Required tool:
77754-TL
Part #
Reference #
Filters
Qty
Part #
Reference #
Valvebodies
Qty
VB-4L80E-1-R '91-'96
- Part #
- VB-4L80E-1-R
- Reference #
- 34740D
- Core charge
- €180.00
- Extra information
- Sonnax GM027
VB Rebuild 4L80E 97-03
- Part #
- 34740EC
- Reference #
- 34740EC
- Core charge
- €180.00
- Extra information
- Sonnax GM028 Corecharge 180,-
VB Rebuild 4L80E 04-
- Part #
- 34740ED
- Reference #
- 34740ED
- Core charge
- €180.00
- Extra information
- Sonnax GM029
Part #
Reference #
Transmission Fluid
Qty
Transmission Fluid GM 1 Liter
- Part #
- TG0002
- Reference #
- TG0002
- Extra information
Performance
DEXRON VI
DEXRON III
DEXRON IIE
Toyota WS
Mercon LV
Mercon SP
Part #
Reference #
Valvebody Components / Transmission Specialties
Qty
Reprogramming kit GM4L80E Stick Shift
- Part #
- 4L80E-3
- Reference #
- Extra information
TRANSGO PART: 4L80E-3
CLASSIFICATION: REPROGRAMMING KITS
FITS: 4L80E, 4L85E, 91-09
FEATURES:
• Stick shift; Upgraded for easier install 11-2009 Full race, Competition, Off road and Pro-street.
• Full manual control. New triple layer
• Plate design with Dual feed Direct Clutch. If you have some POWER: It'll rattle your teeth. Easier Installation!!
Includes: 48-MOD Vacuum Modulator Kit for Proper Pressure Rise Special Instructions: Does not require transmission removal for proper installation.
Reprogrammingkit 4L80E 91-up
- Part #
- 4L80E-HD2
- Reference #
- Extra information
- TRANSGO PART: 4L80E-HD2
CLASSIFICATION: REPROGRAMMING KITS
Fits: 4L80E, 4L85E, 91-09Features:
• Ends direct clutch burnup-Dual feed Direct Clutch, Holds BIG Horsepower.
• Prevents broken case and drum due to excessive pressure.
• Upgraded 10/07 includes triple layer separator plate.
• Easy Installation!Special Instructions:
Does not require transmission removal for proper installation.
Line Press. Booster 4L80E
- Part #
- 4L80E-LB1
- Reference #
- Extra information
Line Press. Booster 4L80E
• Large Ratio Boost Assembly
• Pressure Regulator Spring
• O-Rings (2)
• Achieve shorter shifts and increased torque capacity without creating low-speed harshness
• Improved band and clutch holding capacity for increased durability
• Progressive pressure increase as driving conditions become more demanding
• All the benefits of increased line pressure without overloading the pump at idle
• Simple and affordable drop-in solution with no special tools or reaming required.
Spacerplate 4L80E 1991-up
- Part #
- 48-PLT-01
- Reference #
- Extra information
- Fits General Motors 4L80E and 4L85E 1991-2009 A replacement Separator plate that fits between the valve body and transmission case. Tempered steel for longer life. Plated for rust resistance. Utilized when OEM plate is damaged by balls wearing through plate. Does not include gaskets.
Boostvalve 4L80E Self regulating
- Part #
- 34200-10K
- Reference #
- Extra information
Boostvalve 4L80E Self regulating
• Valve
• Sleeve
• O-Rings (2)
With built-in relief
Symptoms: • Broken clutch piston • Broken servo • Damaged case • High line pressure Cause:
Unregulated EPC pressure forces pressure regulator into high line position.
Correction:
This self-regulating reverse boost valve regulates EPC pressure to 95-105 psi with an encapsulated relief valve.
NOTE: Kit includes instructions to retrofit parts dating back to 89.
Press.reg.valve 4L80E Modified
- Part #
- 34200-14K
- Reference #
- Extra information
Press.reg.valve 4L80E Modified
The OE pressure regulator valve design prevents adequate cooler flow at low RPM and high pressure/demand conditions, which can create overheat complaints. Additionally, in '99-later vehicles, the factory EPC pressure was set high at idle, resulting in engine surge conditions.
The Sonnax line-to-lube pressure regulator valve provides a significant increase in cooler flow under low RPM and high pressure conditions that benefits all vehicles, and eliminates the need for reprogramming '99-later vehicles with high EPC pressure at idle.
Symptoms: • Engine surge at idle • Low cooler flow • Low TCC release pressure Cause:
Low converter release pressure at idle.
Correction:
The Sonnax replacement pressure regulator valve allows regulated flow to the converter charge/lube circuit at vehicle idle, while preventing converter or pump drainback.
AFL kit 4L80E
- Part #
- 34200-16K
- Reference #
- Extra information
AFL kit 4L80E
• Valve
• Sleeve
• Long Spring
• Short Spring
• Retaining Clip
The actuator feed limit (AFL) valve in GM 4L80-E units has a large reaction area and is greatly affected by side loading, which wears the valve body bore. The EPC solenoid oscillates the torque signal and AFL oil, which increases valve action and accelerates wear.
As bore wear increases, oil pressure is reduced to the shift solenoids, which causes solenoid and ratio codes. The same AFL oil loss results in lower line pressure.
Symptoms: • 2-3 Neutral • 2nd Gear starts • Band failure • Clutch failure • Code 68, 85, 86, 87 • Low solenoid feed pressure • No 4th • Solenoid codes • Wrong gear starts Cause:
Actuator feed limit bore wear results in low pressure at shift and EPC solenoids.
Correction:
Redesigned anodized AFL valve regulates pressure while the wear-resistant sleeve re-establishes hydraulic integrity.
Required tool:
77754-TL
Checkball sleeve 4L80E [4]
- Part #
- 34200-38
- Reference #
- Extra information
Checkball sleeve 4L80E
Package Quantity: 4
Vehicles with GM 4L80-E and 4L85-E transmissions commonly exhibit wear in the Reverse checkball sleeve located in the 3-4 shift valve bore. This issue is caused by normal movement of the checkball within the sleeve over time.
As wear progresses, sealing function of checkball becomes compromised and results in loss of apply pressure to direct clutches.
Symptoms: • 3rd Slip • 4th Slip • Direct clutch burned • Gear ratio codes • No Reverse • Reverse slip Cause:
Excess wear in Reverse checkball sleeve prevents proper application of direct clutches.
Correction:
Restore hydraulic control and prevent premature wear by installing upgraded material Sonnax Reverse checkball sleeve.
Overrun clutch valvekit 4L80E
- Part #
- 34200-40K
- Reference #
- Extra information
Part No. 34200-40K
Fits units '97-later.
Insufficient holding power in the overdrive roller clutch is the underlying cause of chronic overdrive roller clutch failure in hardworking 4L80-E and 4L85-E transmissions. When the roller clutch fails, the damage can be catastrophic and the only fix is replacing the drum, planetary assembly and mating components.
The Sonnax Smart-Tech overrun clutch valve kit 34200-40K offers a hydraulic solution to this known mechanical problem. With unique rerouting of hydraulic fluid pressure, this patented kit keeps the overrun clutch applied at all times (except OD 4th), reinforcing the roller clutch to adequately support heavy loads.
• Improves OD roller clutch holding power in D4 and Reverse ranges
• Extends the life of workhorse transmissions while preventing warranty claims and comebacks
• Installs quickly onto the valve body — no transmission removal needed
Range Gear Overrun Clutch with
Sonnax 34200-40K
Clutch Valve KitOverrun Clutch
with OE
Clutch ValvePark Applied Reverse Applied Neutral Applied Overdrive 1st Applied 2nd Applied 3rd Applied 4th Drive 1st Applied Applied 2nd Applied Applied 3rd Applied Applied D2 1st Applied Applied 2nd Applied Applied D1 1st Applied Applied Any other modifications to the valve body should be completed prior to installing Sonnax Smart-Tech® overrun clutch valve kit.
Sleeve 4L80E Stator support
- Part #
- 34203-01K
- Reference #
- Extra information
Sleeve 4L80E Stator support
The sealing ring surface on the turbine shafts in 4L80-E units can wear because of sealing ring contact, worn stator support bushings or shaft breakage. Sonnax offers a stator support sleeve, 34203-01K, that salvages the stator supports and restores the sealing ring surface for the turbine shaft. This sleeve is a direct replacement for the OE sleeve, and does not require any machining to install.
Symptoms: - Damaged stator support turbine shaft sleeve
Cause:
Sealing ring contact, worn stator support bushing, or turbine shaft breakage.
Correction:
This stator support sleeve salvages damaged stator supports and restores the sealing ring surface for the turbine shaft.
Reverse servo spacer 4L80E
- Part #
- 34528-01K
- Reference #
- Extra information
Reverse servo spacer 4L80E
- Short Spacer
- Belleville Spring Washer
- Flat Washer
- E-clip
- Increased contact area reduces pressure between apply pin and piston by 60%.
- Added Belleville spring washer reduces shock on piston.
- No machining necessary, drop-in components.
- Maximum durability for minimal cost.
Symptoms: - Broken Low/Reverse servo piston
- No Reverse
Cause:
Poor reverse servo design and high pressures in reverse combine to cause reverse servo breakage.
Correction:
Install the Sonnax kit to increase piston to spacer contact area, reduce stress on the underside of the piston and add a Belleville spring washer between piston and apply pin.
Case saver TH400, 4L80 early -98
- Part #
- 34762-10
- Reference #
- Extra information
Case Saver Retainer
Part No. 34762-10Fits all TH400 and '98-earlier 4L80-E.
Sonnax case saver retainer 34762-10 for the GM TH400 and '98-earlier 4L80-E is the only intermediate clutch retaining ring case saver that allows the intermediate band to be retained. The Sonnax case saver fits over the intermediate band anchor lug inside the case and extends rearward to support the intermediate clutch backing plate retaining ring, preventing case lug blow out. There have been a variety of case saver designs over the years, however all require eliminating the intermediate band as is often done in drag racing trans-brake applications. Only the Sonnax case saver retainer supports the intermediate clutch retaining ring, yet is thin enough to allow the intermediate band to be installed, allowing case lug protection in all applications.
- Protects case lugs from blow out
- Salvages cases with one or two blown lugs
- Use with or without intermediate band
- See instructions for details on identifying '99-later 4L80-E applications.
- Requires modification to intermediate clutch backing plate.
Case saver 4L80 late 99-up
- Part #
- 34762-20
- Reference #
- Extra information
Case Saver Retainer
Part No. 34762-20Fits '99-later 4L80-E.
Sonnax case saver retainer 34762-20 for '99-later GM 4L80-E units is the only intermediate clutch retaining ring case saver that allows the intermediate band to be retained. This case saver fits over the intermediate band anchor lug inside the case and extends rearward to support the intermediate clutch backing plate retaining ring, preventing case lug blow out. There have been a variety of case saver designs over the years, however, all require eliminating the intermediate band as is often done in drag racing trans-brake applications. Only the Sonnax case saver retainer supports the intermediate clutch retaining ring, yet is thin enough to allow the intermediate band to be installed, allowing case lug protection in all applications.
- Protects case lugs from blow out
- Salvages cases with one or two blown lugs
- Use with or without intermediate band
- See instructions for details on identifying '99-later 4L80-E applications.
- Requires modification to intermediate clutch backing plate.
Acc.sleeve 4L80E 4th Rep-kit
- Part #
- 34805-01K
- Reference #
- Extra information
Acc.sleeve 4L80E 4th Rep-kit
- Sleeve
- Pinless Accumulator Piston
- PTFE Seal
- D-Ring Seal
- Pin Bore Plug
Includes Sleeve, Pinless Piston & Seals
Symptoms: - Damaged accumulator bore
- Loss of accumulator control
- Poor shift quality
Cause:
Debris and piston contact can score the 4th accumulator bore.
Correction:
Install this sleeve and pinless accumulator piston.
Servo pin kit TH400, 4L80E
- Part #
- 34912-01K
- Reference #
- Extra information
Adjustable Rear Servo Pin Kit
Part No. 34912-01KFits all TH400 & '95-earlier 4L80-E.
OE Part No. 8624140, 8627193, 8624141, 8627194, 8627195
Sonnax adjustable rear servo pin kit 34912-01K replaces GM TH400 and '95-earlier 4L80-E servo pins. OE pins have seven different lengths to allow for adjustment of the Low/Reverse band but are no longer available from GM. The Sonnax pin kit has an adjustment range that covers the five longest OE pins to allow for accurate setting of the Low/Reverse servo piston travel. The pin features an O-ring groove to prevent leakage of line pressure past the case pin bore.
- Servo Pin
- Screw
- Washers (4) Small
- Washer Large
- O-Rings (2) 1 Extra
TCC Regulator kit 4L80E
- Part #
- 34994-01K
- Reference #
- Extra information
TCC Regulator Valve Kit
- Valve
- Seal Scarf-Cut
- Spring .420" O.D.
- Spring .300" O.D.
Symptoms: - Burnt converter
- Converter shudder
- TCC apply & release concerns
- TCC codes
Cause:
TCC regulator valve bore wear allows loss of crucial apply pressure.
Correction:
Recover hydraulic control and renew TCC performance by installing Sonnax TCC regulator valve kit.
Spring Shiftvalve 4L80E
- Part #
- 34994-02K
- Reference #
- Extra information
Spring Shiftvalve 4L80E
- 1-2 Shift Valve Spring
- 2-3 Shift Valve Spring
Symptoms: - 2nd Gear starts
- 3-4 Neutral
- No 3rd
- No 4th
- No 4th
- Repeated Solenoid B code 86
- Repeated Solenoid B code 87
Cause:
Low signal pressure to shift solenoids A and B.
Correction:
Recalibrated springs for 1-2 and 2-3 shift valves.
NOTE: Springs MUST be used together. This is not a fix for leaking solenoids or leaking seals in the solenoid signal circuitor actuator feed limit circuit. See AFL limit valve repair 34200-16K.
Manual Valvekit 4L80E
- Part #
- 34994-16K
- Reference #
- Extra information
Valvekit 4L80E
- Valve
- AFL Filter End Plug
- End Plug O-Ring
- AFL Filter O-Ring
The OE manual valve in GM 4L80-E and 4L85-E transmissions is prone to bending due to its length and relatively narrow spools. Once bent, the valve causes excess bore wear, allowing critical fluid to escape the chosen circuits. This can result in delayed engagement, low line rise and loss of gear.
Symptoms: - 2nd Gear starts
- Bent valves
- Broken AFL filters
- Code 68, 85, 86, 87
- Delayed engagement
- Gear loss
- Leaking AFL end plug
- Low line rise
- No upshifts
Cause:
Extensive manual valve length, narrow OE spools and minimal valve support result in bore wear and bent valve. Leaking or damaged AFL filter or end plug causes driveability troubles.
Correction:
Restore normal operation by installing upgraded Sonnax manual valve kit.
Bracket 4L80E
- Part #
- 34998-01K
- Reference #
- Extra information
Bracket 4L80E
- Bracket
- Bolts (2)
Symptoms: - Connector pushed into pan area
- Retention tabs break off wiring harness connector
Cause:
The plastic retention tabs that hold the wiring harness connector in place are easily broken. Once broken, the connector may push into the case.
Correction:
This metal bracket positively supports the connector and prevents it from pushing into the case even if the plastic retention tabs are broken.
NOTE: The 4L80-E unit uses two different wiring harness connector styles. The early style has exposed terminals and a red rubber gasket. The late style has a gray plastic enclosure surrounding the terminals. The Sonnax 4L80-E bracket 34998-01K works only with the late style connector.
Manual Shaft 4L80E 91-94
- Part #
- 38511-01K
- Reference #
- Extra information
Manual Shaft 4L80E 91-94
- Shaft
- Metric Flange Nuts (2)
Short Version, '91-1994 units without external NSS
Manual shift shafts in GM 4L80-E '91-'94 and all 400 models can become corroded in harsh environments. Corroded manual shift shafts are not suitable for reuse, especially in remanufacturing. The Sonnax direct replacement manual shift shaft kit 38511-01K has been yellow zinc plated to maximize corrosion resistance from road salt and other environmental contaminates. The flange face of the nuts is serrated for better holding capacity.
- Cost effective solution to OE kit
- Manual shift shaft and flanged nuts are zinc plated for corrosion resistance
- The flange face on the nuts is serrated for better holding
NOTE: This kit does not fit units with external neutral safety switch.
Manual Shaft 4L80E Retro 1995
- Part #
- 38511-03K
- Reference #
- Extra information
Manual Shaft 4L80E Retro 1995
- Shaft
- Metric Flange Nuts (2)
Short Version, Retrofits ’95-later detent levers to early ’91-’94 cores
Sonnax manual shift shaft kit 38511-03K for the GM 4L80-E is an early model '91-'94 manual shift shaft that retrofits to a late-model '95-later manual shaft detent lever, allowing the late-model case and detent lever to be used in early-models. This helps rebuilders use late model cores to rebuild into early-model units. This kit is a more economical solution than the OE manual shift shaft and detent lever kit, without the added cost for such additional components as the OE lever, pin and shaft seal. These parts are rarely used during the rebuild. The manual shift shaft and fasteners have been yellow zinc plated for corrosion resistance to road salt and other environmental contaminates. The flange face of the nuts is serrated for better holding capacity.
NOTE: Adapts the 4L80-E late model (95-later) manual shaft detent lever for use in an early model unit (9194) with a short manual shift shaft. Does not fit units with external neutral safety switch.
Manual Shaft 4L80E 95-up ext. prndl
- Part #
- 38511-04K
- Reference #
- Extra information
Manual Shaft 4L80E 95-up ext. prndl
- Shaft
- Flange Nuts (2)
- 1995 & later with external neutral safety swich
- Long style
- Zinc Plated
Pump conversion kit 4L80E 97-up -->04-up
- Part #
- K0128
- Reference #
- Extra information
- 4L80-E Pump Conversion Kit (Superior K0128) Problem Solvers This kit allows the user to modify and install a 1997 -2003 pump into a 2004 - Up 4L80-E unit thus saving substantial money in having to purchase a late 2004 - Up pump. It's quick and simple to install and comes with 3 fixes per box. Note to purchasing: Ask for Superior part number K0128
Boostvalve 4L80E
- Part #
- 34200-01K
- Reference #
- 38898
- Extra information
Boostvalve 4L80E
- Valve
- Sleeve
- Sleeve O-Rings (2)
- Balance Plug
- Balance Plug O-Ring
O-ring style
Symptoms: - Broken parts
- Buzzing noise
- High line pressure
- Uncontrollable line rise
Cause:
Worn boost valve sleeve allows reverse oil leakage and worn end plug causes imbalance of the pressure regulator valve.
Correction:
Ensure proper regulator valve control with this O-ringed balance oil plug and boost valve & sleeve kit that replaces either the 1997-later or 1996-earlier OE boost valve designs.
Part #
Reference #
Frictions
Qty
Part #
Reference #
Steels
Qty
Dished plate 4L80E,TH400 direc
- Part #
- 031767D137
- Reference #
- 34127
- Extra information
Part #
Reference #
Bands
Qty
Band Front TH400, 4L80E Interm. 25mm
- Part #
- 41590
- Reference #
- 34022
- Extra information
Band Front GM4L80E 1-1/4" 99-up 32.mm BW
- Part #
- 50236BW
- Reference #
- 34022HD
- Extra information
- Borg Warner
Band rear 4L80E 2nd Design, TH400 OEM
- Part #
- 38014BW
- Reference #
- 34024
- Extra information
Part #
Reference #
Pressure Plates
Qty
Part #
Reference #
Bushings
Qty
Bushing 4L80E Pump 97-up
- Part #
- 33423
- Reference #
- 34034BA
- Extra information
- Full bonze
Bushing Front stator 4L80E [4]
- Part #
- 34016-W
- Reference #
- 34036B
- Extra information
Bushing Front stator 4L80E [4]
Package Quantity: 4
- Width: 0.675"
- Housing Bore: 1.244"
- Shaft Dia.: 1.123"
- Material: Steel-backed bimetal
- Bushing Style: Precision
GM 4L80-E and 4L85-E units may display no converter lockup or codes 68, 39, 1870 or P0741. Imbalance of torque converter clutch apply oil through the front stator support bushing contributes to this complaint. A journal clearance of .002" or more will generate sufficient leakage to cause lockup clutch slippage, causing the transmission to stay in third gear. Sonnax front stator support bushing 34016-W is designed to reduce leakage by minimizing journal clearance and also increasing journal length.
NOTE: Due to stator shaft variations, in some cases it may be necessary to hone the bushing I.D. slightly for proper fit. See instructions for details.
Bushing 4L80E,TH400 Rear Case fla
- Part #
- 34006-SP
- Reference #
- S34064BA
- Extra information
- The OE case bushing in vehicles with a THM-400 or 4L80-E transmission tends to walk out of the housing bore. This allows the bushing to wander into the extension housing, leaves the output shaft unsupported, and may ruin the governor gear and cause case damage. Sonnax bushing 34006-SP is specially designed to remain in the case bore. High-quality bearing bronze Flange on the transmission case side prevents bushing from pushing completely through the bore Flange accurately locates and helps retain the selective washer Machined oil grooves allow for a supply of lubricating oil to enter the extension housing as well as the transmission case. Note The housing bore should measure between 2.1285"/2.1295" in diameter for an ideal fit. When damage to the case is so severe that bore diameter is larger than 2.129", use Sonnax oversized case bushing 34006-OS. See instructions for details. Specs Material: Bronze Bushing Style: Precision Width: 0.690" Shaft Dia.: 2.006" Housing Bore: 2.129"
Part #
Reference #
Seals
Qty
Part #
Reference #
Gaskets
Qty
Part #
Reference #
Washers & Bearings
Qty
Bearing OD Planet 4L80E, 4T60E, 4T65E
- Part #
- 34821-01
- Reference #
- 34214
- Extra information
Bearing OD Planet 4L80E, 4T60E, 4T65E
Overdrive Planetary
- Outer Dia.: 1.802"
- Inner Dia.: 1.132"
- Thickness: 0.168"
- Bearing Style: Enclosed
- Material: Hardened Steel
34821-01 is a direct replacement for the planetary thrust bearing. This bearing is known to fail and destroy the planet gears. Replace the bearing during a rebuild to prevent a costly failure.
- Chevy & GM trucks, vans, Astro, Safari, Blazer, Yukon, Suburban, and more
- Not available from OEM
- Salvages costly planetary assemblies
NOTE: Check bearing locations. 4L80-E: Overdrive Planet 4T60 & E, 4T65-E: Input Carrier
Washer 4L80E Forw.clutch [5]
- Part #
- 34301-078
- Reference #
- S34235BK
- Extra information
Forward clutch hub washer (rear)
Package Quantity: 5
- Outer Dia.: 1.780"
- Inner Dia.: 1.405"
- Thickness: 0.078"
- Material: Steel
A pump that has been resurfaced or accumulated shaft spline wear creates excessive endplay of the forward and direct drums. This reduces sealing ring, clutch, bearing, and thrust washer life. Having the ability to shim both the lower unit sun gear with Sonnax shim 34500-Z on 96 and earlier units and washer 34301-078 or 34301-094 on all units addresses these problems.
- Washer 34301-078 (.015" oversized) and 34301-094 (.030" oversized) take up the play between the forward clutch hub and the direct clutch housing, allowing front unit endplay to be reduced.
- Washers also stabilize the direct drum, reducing delayed reverse and improving 2-3 clutch circuit.
- Allows salvage of valuable hard parts.
Part #
Reference #
Electrical Components
Qty
Wire rep.kit 4L60E ext. PRNDL 4L80E
- Part #
- 74446K
- Reference #
- Extra information
- 4L60-E (95-03) 4L80-E (94-00) Wire Harness Park/Neutral Switch (Includes 4 & 7 Pin Connector)
Speedsensor Input/Output 4L80E
- Part #
- 20A-101
- Reference #
- 34436
- Extra information
- 2 pieces per transmission
PRNDL Switch 4L60E extern/4L80E 95-03
- Part #
- 15D-327
- Reference #
- 74410
- Extra information
- 2 connectors
Solenoid EPC 4L80,4L30,4L60,4T80 91-03
- Part #
- 50058
- Reference #
- 74435A
- Extra information
- Black can 24220158
Solenoid EPC 4L80E 2004-up, 4T80E
- Part #
- 50105
- Reference #
- 94435A / 34435A
- Extra information
- OEM 24225320, 24248892
Part #
Reference #
Sprags & One way clutches
Qty
Roller Low 4L80E 95-UP
- Part #
- 34402B
- Reference #
- 34654E
- Extra information
- With 8 legs
Part #
Reference #
Pistons
Qty
Part #
Reference #
Hard Parts
Qty
Pumpgearset 4L80E 97-up
- Part #
- 34201E-SP
- Reference #
- 34530
- Extra information
Sonnax pump gear set 34201E-SP is designed to meet or exceed OE pump gear performance in 4L80/85-E transmissions with no machining required. These pump gears are specially designed to improve the fit of the gears in the pump body and on the torque converter hub.
• Salvages costly pumps
• OE gear performance
• Improved tolerance
Note
Sonnax gears cannot be mated to either OE gear; gears must be used as a matched set.
Contents
• Inner Pump Gear
• Outer Pump Gear
Symptoms
• Lost or damaged components
Inputshaft 4L80E Extreme Duty
- Part #
- 34670-02
- Reference #
- 34670
- Extra information
- Extreme Duty Input Shaft Part No. 34670-02 OE Part No. 24222184 Input shaft failure is a common problem in performance GM 4L80-E and 4L85-E transmissions running with extreme horsepower. OE and aftermarket shafts simply don’t hold up in these conditions, leading to spline twist and shaft breakage. Sonnax extreme duty input shaft 34670-02 is manufactured from an exceptionally tough, high-strength Aermet steel alloy with proprietary heat treatment for unrivaled performance and durability. Additional features like an advanced torsional design, plus unique improvements to the spline and sealing ring areas, make this the most durable input shaft available for 4L80-E and 4L85-E units. This extreme duty shaft is recommended for applications above 1,000HP. Heat-treated Aermet steel outperforms all other shaft materials in strength and toughness Hobbed O.D. carrier spline eliminates deep undercut where other shafts fail Advanced torsional design with spline, seal ring groove and cross-hole refinements deliver additional strength
Part #
Reference #
Tools
Qty
Tool Pump remover universal
- Part #
- T-0033
- Reference #
- Extra information
- T-0033 Universal Pump Remover Quickly removes conventional type pumps without damage
Tool Harness Removal Tool 4L60E, 4L80E
- Part #
- TGM-HR
- Reference #
- Extra information
- Use this great new tool with or without a bushing driver to make harness removal a snap, even with transmission still in vehicle. Fits: GM 4L30E, 4L60E and 4L80E.
Reamer AFL 4L60E,4L80E
- Part #
- 77754-TL
- Reference #
- Tool
- Extra information
Tool Kit
- Reamer
- Core Drill 4L80-E Only
- Reamer Jig 4L60-E Only
- Drill Guide 4L80-E Only
- Reamer Jig 4L80-E Only
Tool Kit for 77754-09K, 34200-16K, SC-4L60E and SC-4L80E
Part #
Reference #
Various
Qty
Modulatorkit 4L80E
- Part #
- 48-MOD
- Reference #
- Extra information
Fits General Motors 4L80E and 4L85E 1991-2009
Includes Modulator Canister, "Modulator bushing and valve", Modulator pin, Resistor, Pressure Regulator spring and items necessary to utilize vacuum for pressure rise.
Replaces PCS/EPC (Pressure Control Solenoid) for Heavy Duty, High Performance and No Computer, Great for transplants. Kit allows for control of Pressure Rise with vacuum instead of vehicle PCM controlling PCS/EPC Solenoid. This kit is included with the 4L80E-3 Stick Shift Kit.
Notice: 48-MOD kit does not shift the transmission through its gear ranges, it utilizes the manifold vacuum signal from the engine to raise and lower transmission pressure as needed for proper clutch and band holding capacity during up shifts and downshifts.
NOTE: Does Not fit DieselInstallation recommendation: Experienced technician
Transmission removal necessary: No
Bracket 4L60E, 4L80E Shiftcable Conversi
- Part #
- 34913-01
- Reference #
- 74761
- Extra information
Shift Cable Mount Bracket
Part No. 34913-01
1996 and 1995 transmission cases have neutral safety switch mounting holes but do not have the top mount shifter bracket holes. Sonnax offers a pan-mount bracket, 34913-01, that allows installation of 1994-95 transmissions or cases into 1996-97 vehicle that originally had case mounted shifter brackets. Additionally, if a late case has damaged or broken top mount bosses, the Sonnax bracket can be used as an alternative to correctly mount the shifter cable and allow reuse of the case.
Converts To be used in 1994-95 4L60-E Case 1996-97 Vehicles 1994-95 4L80-E Case '96 Vehicles Replaces OE bracket for units with broken bosses 4L60-E
Bracket Stamped 159952471996-2000 CK Truck 1996-2005 M/L Astro Van 4L80-E
Bracket Stamped 159952461996-1997 CK Truck
Part #
Reference #
Torque Converters
Qty