TH400
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Repair kits
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OH TH400 65-up Transtec
- Part #
- DP2405
- Reference #
- 34002A
- Extra information
OH TH400 65-up Combo Precision
- Part #
- K34900C-MD
- Reference #
- 34002A
- Extra information
Frictionpack TH400 HP Blue Raybestos
- Part #
- RCPBP-03
- Reference #
- 34119blue
- Extra information
- The Gen2 Blue Plate Special, the ultimate racing clutch for automatic transmissions, is the perfect clutch for ALL TYPES of racing. It features an improved Raybestos-developed material that offers optimum shifting at a level above standard racing clutches. It provides a positive engagement under high power conditions where all of the energy absorption is condensed into a very short length of time. Gen2 is a state-of-the-art, power absorbing clutch that performs with very low wear, excellent fatigue strength, high durability and quick shifts with little shock for even faster times.
Shift Kit TH400 Transgo
- Part #
- K34908
- Reference #
- T34165
- Extra information
- TRANSGO PART: SK 400 CLASSIFICATION: SHIFT KIT FITS: THM 400 65-up FEATURES: Corrects/Prevents/Reduces: Soft Late Shifts: 3rd clutch burnup; rough 1-2; Excess passing gear; late shifts Special Instructions: Does not require transmission removal for proper installation.
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Filters
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Filter TH400 67-up brass, Allison AT540
- Part #
- 34661AB
- Reference #
- 34010B
- Extra information
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Valvebody Components / Transmission Specialties
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Line Press. Booster TH400
- Part #
- 400-LB1
- Reference #
- Extra information
Line Press. Booster TH400
Sonnax hydraulic line pressure booster kits contain stronger pressure regulator springs and large ratio boost valves designed to work together to provide progressive pressure increases as driving conditions become more demanding. Our pressure regulator springs are approximately 10% stronger than OE and more conservative in impact than other aftermarket kit springs. Large ratio boost valves provide higher pressure incrementally and when it is needed the most. The combination of these springs and valves in a Sonnax kit gives you the best of both worlds: a modest pressure increase at the low end, with a high-end pressure that is equal to or greater than that of other aftermarket kit springs. 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
End-play shim TH400
- Part #
- 34500-Z
- Reference #
- Extra information
End-play shim TH400
Package Quantity: 10
Updated design tang style , 1997 & later, .010" Thick
Outer Dia.: 1.940"
Inner Dia.: 1.165"Thickness: 0.010"Material: SteelTang Count: 3It is often difficult to reduce front unit endplay on 400 or 4L80-E units with excessive spline wear. Normal component wear allows excess forward and direct drum travel. This travel or free-play reduces sealing ring life.
The 400 and 4L80-E are limited on the thickness of pump shim material that can be added. Excessive shimming at the pump will push the forward drum off the rings and result in a burned forward clutch. Sonnax offers a .010" thick shim, 34500-Z, that can be stacked under the sun gear bearing race.
• By lifting the sun gear, the drums are also supported and front unit endplay is reduced.• The shim can be installed between the sun gear thrust bearing and the rear internal gear during lower unit assembly.• Updated design fits all model yearsSymptoms: • Burnt Forward clutch• Excess front endplay• Excess rear endplay• Premature seal ring failureCause: Normal component wear allows forward and direct drum travel, resulting in excessive endplay
Correction:
This unit endplay shim allows for proper setting of front unit endplay and supports the direct drum by supporting the sun gear.
NOTE: Updated design Tang Style Shim can now be used on all units, including 4L80-E 97-later
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.
Boostvalve TH400 Standard
- Part #
- 34910-01K
- Reference #
- Extra information
Boostvalve TH400 Standard
Vehicles with a GM 400 transmission frequently have poor line rise, soft 1-2 and/or 2-3 shifts and/or reverse engagement difficulties. These problems can be caused by the reciprocating boost valve wearing the inside diameter of the boost sleeve. When this occurs, oil that enters the modulated throttle valve orifice leaks past the boost valve and exhausts through the reverse orifice or to the sump, resulting in poor line rise. Reverse oil also can exhaust both to the sump and back through the modulated TV orifice. The outside diameter of the boost sleeve also allows some leakage through the pump body, which can increase boost oil loss. Sonnax boost valve kit 34910-01K eliminates the above problems by restoring hydraulic integrity and providing a positive seal with the pump bore. Valve and sleeve manufactured from high-quality steel O-rings provide additional protection against leakage through the pump body to assist in maintaining pressure in the circuits which supply the boost valve Kit uses the same valve spool diameters as the OE version to retain factory shifts
Pressure Regulator Kit TH400
- Part #
- 34910-03K
- Reference #
- Extra information
Pressure Regulator Kit TH400
- Valve
- PTFE Seals (2)
- End Plug
- O-Ring
High-mileage vehicles with a THM 400 often experience poor line pressure control due to a worn pressure regulator bore. This will result in high cooler pressure and converter, crankshaft, and/or friction element failure. This bore wear can be verified by testing line pressure and Wet Air Testing the pump. This hardened steel valve continuously oscillates within the cast-iron pump bore, resulting in wear. Balance line pressure is then allowed to leak past the valve and exhaust to the sump. This prevents the pressure regulator valve from moving completely to the lower line pressure position. Sonnax offers a pressure regulator valve kit 34910-03K that eliminates these problems.
- The pressure regulator valve has been modified to incorporate a solid PTFE seal ring that properly separates the balance line circuit from the pump suction, preventing cross leakage.
- Kit also includes an o-ringed end plug to ensure proper back pressure to the pressure regulator valve.
- This kit eliminates the need to replace the pump casting to ensure pressure control.
Symptoms: - Delayed converter charge
- High & uncontrollable line pressure
- Poor Reverse engagement
Cause:
Worn pressure regulator valve bore.
Correction:
This pressure regulator valve kit includes a solid PTFE seal ring to separate the balance line circuit from the pump suction and an o-ringed endplug to ensure proper back pressure to the pressure regulator valve.
Shift point package TH350,TH400,TH700
- Part #
- K018
- Reference #
- Extra information
- 1. The Shift Point Package will service governors in the 700-R4, 400, 350, 350C, 250 and 250C.2. The kit includes 6 weights and 6 springs to offer a wide range of adjustments. 3. This kit includes new weight pins with E-clip ends for easy adjustment.4. This package is a great help when dealing with rear end ratio changes and performance applications.
Reverse cushion kit TH400
- Part #
- K34908B
- Reference #
- 34166
- Extra information
- This reverse cushion kit, also known as a reverse accumulator kit, fixes bang reverse and installs fast with the transmission on the bench or in a vehicle. Corrects/Prevents/Reduces: Harsh reverse engagement Includes: Washers E clip Springs Pin
Reprogramming Kit TH400 Transgo
- Part #
- 400 1-2
- Reference #
- T34169
- Extra information
- TRANSGO PART: 400-1&2 CLASSIFICATION: REPROGRAMMING KIT FITS: THM 400 65-up FEATURES: Automatic shift; Street or full-race; Holds 1st and 2nd to any rpm; Backshifts to 2nd and 1st at any rpm; Tow & Go and Competition combination Special Instructions: Does not require transmission removal for proper installation.
Reprogramming Kit TH400 Stick Shift
- Part #
- 400-3
- Reference #
- T34173
- Extra information
- TRANSGO PART: 400-3 CLASSIFICATION: REPROGRAMMING KIT FITS: THM 400 65-up FEATURES: Stick Shift; Full race; Competition, Off road and Pro-street. Full manual control; Converts back to automatic from the outside, in 5 minutes. Special Instructions: Does not require transmission removal for proper installation.
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Frictions
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Steels
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Dished plate 4L80E,TH400 direc
- Part #
- 031767D137
- Reference #
- 34127
- Extra information
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Bands
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Band Front TH400, 4L80E Interm. 25mm
- Part #
- 41590
- Reference #
- 34022
- Extra information
Band rear 4L80E 2nd Design, TH400 OEM
- Part #
- 38014BW
- Reference #
- 34024
- Extra information
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Pressure Plates
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Bushings
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Bushing Pump TH350/TH400/Powerglide Tefl
- Part #
- 34034T-01
- Reference #
- 44034
- Extra information
Bushing Pump TH350/400/Powerglide
OE Part No: 29511860
- Width: 0.615"
- Housing Bore: 2.001"
- Shaft Dia.: 1.873"
- Bushing Style: Precision
- Material: Steel-backed bimetal
Worn babbit pump bushings in GM Powerglide, 350, 400 and Allison® AT540 units allow the converter hub and inner pump gear to move off-center, causing damage to the pump gears and pump housing crescent. Sonnax pump bushing 34034T-01 is a direct replacement part that is better fitting than OE. Extremely wear-resistant, this PTFE-lined Kryptonite bushing helps maximize the life of these older and increasingly rare pumps.
- Highly wear-resistant PTFE lining for maximum durability
- Tight tolerance for improved fit
- Longer pump life
- Direct replacement part with no machining required (including Allison Part No. 29511860)
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"
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Seals
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Seal Ext.Housing TH400 large [in OH]
- Part #
- 34743A
- Reference #
- 34074
- Extra information
Seal Pump TH180,TH350,TH400 PowerGlide
- Part #
- 38151L
- Reference #
- 44070
- Extra information
Seal selectorshaft TH180/400/350/700,6L8
- Part #
- 38511G
- Reference #
- 74072
- Extra information
- OEM 24235861 8L90
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Gaskets
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Washers & Bearings
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Bearingkit TH400 65-up
- Part #
- SBK-G10
- Reference #
- 34201
- Extra information
Bearingkit TH400 65-up
- Sun/Internal Gear (3)
- Center Support/Sun Gear/Race (3)
- Center Support/Sun Gear (3)
1976-1997
Washer Pump TH400 oversize [5]
- Part #
- 34301-094
- Reference #
- S34235BAK
- Extra information
Washer Pump TH400 oversize [5]
Package Quantity: 5
- Outer Dia.: 1.780"
- Inner Dia.: 1.405"
- Thickness: 0.094"
- 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 washer34301-078 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.
Washerset TH400, 4L80E Fwd Hub
- Part #
- 34298-078
- Reference #
- S34235BK
- Extra information
Washerset TH400, 4L80E Fwd Hub
Package Quantity: 5
- Outer Dia.: 1.781"
- Inner Dia.: 1.289"
- Thickness: 0.078"
- Material: Steel
Sonnax forward clutch hub washer 34298-078 is .015" thicker than the OE version and replaces the OE .063" thick washer between the forward clutch hub and the forward drum. This allows front unit endplay to be reduced. This new washer is an alternative to the Sonnax washers, 34301-078 and 34301-094. Shimming at this location maintains the relationship with the forward clutch hub and direct drum and does not alter the endplay path through the unit.
- Forward hub washers are .015" thicker than OE
- Installation between the forward drum and forward clutch hub reduces front unit endplay
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Electrical Components
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Sprags & One way clutches
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Roller Low 4L80E 95-UP
- Part #
- 34402B
- Reference #
- 34654E
- Extra information
- With 8 legs
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Hard Parts
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Statorshaft TH400 Heavy Duty
- Part #
- 34910S-01
- Reference #
- 34520
- Extra information
Stator Support Shaft
Part No. 34910S-01Sonnax offers this heavy-duty stator support shaft for the GM 400 transmission. In order to improve strength, the shaft is made from heat treated Chromoly steel and has increased wall thickness.
- Made from heat treated Chromoly steel
- Induction-hardened spline and serrations
Manual Shaft TH400
- Part #
- 38511-05K
- Reference #
- 34991-4
- Extra information
Manual Shift Shaft Kit
Part No. 38511-05KFits GM TH400 units only.
- Manual Shift Shaft
- Metric Flange Nuts (2)
- TH400 specific design minimizes amount of shift linkage adjustment necessary
- Cost effective solution to OE late model manual shift shaft
- Manual shift shaft and flange nuts are zinc plated for corrosion resistance
- Flange of nuts is serrated for better holding
Modulator TH350,TH400 Dual Red stripe
- Part #
- 44160D
- Reference #
- 44160D
- Extra information
Pumpgear AT540, TH400 .727" Allison
- Part #
- 41282
- Reference #
- 44530AC
- Extra information
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Various
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Fillertube TH200, H200-4R,TH350,TH400
- Part #
- K35999T
- Reference #
- 44494
- Extra information
- 200,200C,20-R4,350,350C AND 400
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Torque Converters
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Complete transmissions
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Converter Parts
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