4T65-E AFL Valve Repair Kit (Superior K098)

Problem Solvers Complaint: Sets various Codes, most notably the "P1811" Max adapt or long shift completion , or various T.C.C. slip/error codes. Can also cause 2ND gear starts.

Cause: Low Pressure from AFL signal/balnace oil leaks resulting from valve bore wear - specifically, from the small end of the balance side of the valve bore in the channel plate casting.

Correction: Install Superior's K098 AFL VALVE FIX, The newly Designed AFL valve and spring combo along with a simple cup plug will stop the leak! And since the valve's "Superior" design spreads the loads across the entire length of the rear casting, its along term Simple Solution sure to stop wear and leaks in it's tracks! The valve kit is quick and easy to install without purchasing extra tools, reamers or costly replacement Valves and Sleeves.

Note to purchasing: Ask for Superior part# K098

Line Pressure Booster Kit

Part No. 4T65E-LB1

•Large Ratio Boost Assembly
•Pressure Regulator Spring

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.

These 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

Differential Lube Tube Retainer Kit

Symptoms:

•Differential lube failure
•Difficulty in retaining differential lube tube

Cause:

The differential lube tube is not mechanically retained. With heat and pressure the lube tube can move out of the accumulator housing and into the rubber hose section, causing a loss of lube oil.

Correction:

This clamp is designed to clamp the differential lube tube to the forward servo tube, preventing movement of the differential lube tube.

Accumulator pin kit 4T60E

• Pins (4)

 Fits 1-2 and 2-3 accumulator locations only

GM 4T60 and 4T60-E units commonly display negative shift characteristics that can be traced to excess wear at the 1-2 and 2-3 accumulator piston pin bores. Slipping, flares, and soft or inconsistent shifts often result, followed by burnt 2nd and 3rd clutches. Extreme cases will cause a loss of 2nd, 3rd and/or 4th gears. Restore hydraulic control and banish sloppy shifting by reconditioning the pin bore and installing Sonnax oversized accumulator pin 84573-01K.

Symptoms:

•1-2 Flare
•2-3 Flare
•2nd Clutch burned (GM)
•2nd Slip
•3rd Clutch burned
•3rd Slip
•No 2nd
•No 3rd
•No 4th
•Soft & inconsistent shift feel

Cause:

Excess wear at accumulator piston pin bore allows circuit pressure to escape.

Correction:

Recover hydraulic control and renew shift feel and performance by reconditioning the pin bore and installing Sonnax oversized accumulator pin.

Accumulator pin kit 4T60E

• Pins (10)
• Reamer

 Fits 1-2 and 2-3 accumulator locations only

GM 4T60 and 4T60-E units commonly display negative shift characteristics that can be traced to excess wear at the 1-2 and 2-3 accumulator piston pin bores. Slipping, flares, and soft or inconsistent shifts often result, followed by burnt 2nd and 3rd clutches. Extreme cases will cause a loss of 2nd, 3rd and/or 4th gears. Restore hydraulic control and banish sloppy shifting by reconditioning the pin bore and installing Sonnax oversized accumulator pin 84573-02K.

Symptoms:

•1-2 Flare
•2-3 Flare
•2nd Clutch burned (GM)
•2nd Slip
•3rd Clutch burned
•3rd Slip
•No 2nd
•No 3rd
•No 4th
•Soft & inconsistent shift feel

Cause:

Excess wear at accumulator piston pin bore allows circuit pressure to escape.

Correction:

Recover hydraulic control and renew shift feel and performance by reconditioning the pin bore and installing Sonnax oversized accumulator pin.

AFL sleevekit 4T65E

Symptoms:

• 2nd Gear starts
• Code 1811
• Long shifts
• Maximum adapt
• Poor EPC control
• TCC piston failure
• TCC slip

Cause:

Actuator feed limit bore wear results in unregulated pressure at the EPC solenoid, 1-2, 3-4 shift solenoid and the 1-2, 3-4 shift signal circuit.

Correction:

This wear-resistant sleeve and valve assembly allows the salvage of the case cover by re-establishing hydraulic integrity of the AFL circuit.

Required tool:

Reamerkit 4T65E AFL: F-84596-TL

L/U valve & plug 4T60E

For 1993 - later

Symptoms:

Code 39, 740, 1870
Converter shudder
Falls out of lockup when hot
Overheated converter

Cause:

Low converter apply pressure, caused by a worn regulator valve bore and insufficient isolator boost/PWM oil, or wear at the isolator bore.

Correction:

The redesigned isolator valve and TCC regulator sleeve and valve kit prevents excessive wear and restores these critical bores to their original operating clearances.

L/U valve & plug 4T60E

For 1991 - 1992

Symptoms: 

Converter shudder
Falls out of lockup when hot
Overheated converter

Cause:

Low converter apply pressure, caused by a worn regulator valve bore and insufficient isolator boost/PWM oil, or wear at the isolator bore.

Correction:

The isolator valve and TCC regulator sleeve and valve kit prevents excessive wear and restores these critical bores to their original operating clearances.

Required tool:

Reamer: 84754-RM

Boostvalve 4T60E

• Valve
• Sleeve
• Spring

Low Ratio, .276 dia. small spool

Vehicles with 4T60E or 4T60-E transmissions often exhibit problems as poor line rise, soft shifts, poor reverse boost and/or 2nd and 3rd clutch distress. These problems are often caused by worn and leaking boost sleeves. 

Symptoms: 

• 2nd Clutch distress
• 3rd Clutch distress
• Low line rise
• Soft shifts

Cause:

Worn and leaking boost sleeves

Correction:

This replacement boost valve kit provides more sealing area. Sleeves and valves made from high-quality hardened steel to prevent excessive wear.

Reverse boostvalve 4T60E

Low ratio, .273 dia. small spool

Vehicles with 4T60 or 4T60-E often exhibit problems as poor line rise, soft shift, poor reverse boost and/or 2nd and 3rd clutch distress. These problems are often caused by worn and leaking boost sleeves. 

Symptoms:

Low Reverse boost

Cause:

Worn and leaking boost sleeves

Correction: This boost valve kit provides more sealing area. Sleeves and valves made from high-quality hardened steel to prevent excessive wear.

TCC valve 4T60E Overside

1996 and earlier

The TCC apply valve act as the switch valve for converter apply and release.
If the apply valve is worn, it often returns to the un-apply position even though the TCC solenoid remains energized. Generally the apply valve causes larger changes in slip RPM as the converter cycles from apply to full release. 

Symptoms: Code 39, 740, 1870 Falls out of lockup when hot Low cooler flow Overheated converter Shudder Cause: Wear of the TCC apply valve bore allows leakage of TCC signal oil to exhaust and the apply valve to move into the TCC release position. Correction: Wear of the TCC apply valve bore allows leakage of TCC signal oil to exhaust and the apply valve to move into the TCC release position.

Required tool:

Reamer 4T60E TCC-valve: 84754-TL5

Modulated line boost valve kit

High Ratio, .199" dia. small spool

Vehicles with 4T60 or 4T60-E transmissions often exhibit problems as poor line rise, soft shifts, poor reverse boost, and/or 2nd and 3rd clutch distress. These problems are often caused by worn and leaking boost sleeves.

 Symptoms:

2nd Clutch distress
3rd Clutch distress
Low line rise
Soft shifts

Cause:

Worn and leaking boost sleeves

Correction:

This boost valve kit provides more sealing area. Sleeves and valves made from high-quality hardened steel to prevent excessive wear.

Reverse boost valve kit

High Ratio, .293" dia. small spool

Vehicles with 4T60 or 4T60-E transmissions often exhibit problems as poor line rise, soft shifts, poor reverse boost, and/or 2nd and 3rd clutch distress. These problems are often caused by worn and leaking boost sleeves.

Symptoms:

Low Reverse boost

Cause:

Worn and leaking boost sleeves

Correction:

This replacement boost valve kit provides more sealing area. Sleeves and valves made from high-quality hardened steel to prevent excessive wear.

TCC Valve 4T60E OEM-size

1996 & earlier with steel valve

The TCC apply valve acts as the switch valve for converter apply and release. The TCC regulator valve (84754-01K and 84754-08K) controls TCC apply pressure. Both the apply valve and the regulator valve can cause slip codes. When the apply valve is worn, it often returns to the unapply position even though the TCC apply solenoid remains energized. Generally the apply valve causes larger changes in slip RPM as the converter cycles from apply to full release. The regulator valve causes a more gradual load and heat-sensitive slip. 

Symptoms:

Code 39, 740, 1870
Falls out of lockup when hot 
Low cooler flow
Overheated converter
Shudder

Cause:

Wear of the TCC apply valve bore allows leakage of TCC signal oil to exhaust and the apply valve to move into the TCC release position.

Correction:

Wear of the TCC apply valve bore allows leakage of TCC signal oil to exhaust and the apply valve to move into the TCC release position.

Related parts:

84754-16K, 84754-97K and 84754-98K

1-2 shift valve

The OE 1-2 shift valve in 4T60-E units is prone to wear and side loading because it is made of raw aluminum. The valve tends to stick in place when shifting from 1st to 2nd, and even when the PCM has commanded a 1-2 shift by turning off the A solenoid, the worn OE valve may fail to make the shift because it is stuck in the 1st gear position.

Symptoms:

1-2 Shuttle
2nd Gear start with light throttle bump back to 1st
No 2nd

Cause:

OEM valve wears and sticks.

Correction:

This drop-in replacement valve is hard anodized with annular grooves to reduce sticking and does not require a reamer.

Reverse & Modulated line boost valve kit

• Modulated Line Boost Valve 
• Modulated Line Boost Sleeve 
• Modulated Line Boost Spring 
• Reverse Boost Valve 
• Reverse Boost Sleeve 
• Reverse Boost Spring 

Low ratio

Vehicles with 4T60 or 4T60-E transmissions often exhibit such problems as poor line rise, soft shifts, poor reverse boost, and/or 2nd and 3rd clutch distress. These problems can often be caused by worn and leaking boost sleeves.

Symptoms:

2nd Clutch distress
3rd Clutch distress
Low line rise
Low Reverse boost
Soft shifts

Cause:

Worn and leaking boost sleeves

Correction:

These replacement boost valve kits provide more sealing area. Sleeves and valves made from high-quality hardened steel to prevent excessive wear.

Reverse & Modulated line boost valve kit

• Modulated Line Boost Valve 
• Modulated Line Boost Sleeve 
• Modulated Line Boost Spring 
• Reverse Boost Valve 
• Reverse Boost Sleeve 
• Reverse Boost Spring 

High Ratio

Vehicles with 4T60 or 4T60-E transmissions often exhibit problems as poor line rise, soft shifts, poor reverse boost, and/or 2nd and 3rd clutch distress. These problems are often caused by worn and leaking boost sleeves.

Symptoms:

2nd Clutch distress
3rd Clutch distress
Low line rise
Low Reverse boost
Soft shifts

Cause:

Worn and leaking boost sleeves

Correction:

These replacement boost valve kits provide more sealing area. Sleeves and valves made from high-quality hardened steel to prevent excessive wear.

Boostvalve 4T65E

• Valve 
• Sleeve 

Vehicles with a 4T65-E transmission often exhibit such problems as soft upshifts (especially 1-2), delayed reverse and low line rise. This can be traced to wear of the OE boost sleeve assembly. The OE boost sleeve assembly consists of two steel valves and a steel plug that reside in the boost sleeve. The steel valves wear the aluminum sleeve and allow leakage of boost pressure. The OE boost assembly is not serviceable separately from OE, which forces the purchase of a new and expensive valve body. Sonnax offers an upgraded boost sleeve assembly 84754-30K to replace the worn OE parts and allow the OE valve body to be used and restore the hydraulic integrity of the circuit.

TCC Regulator sleevekit 4T65E

• Valve 
• Sleeve 
• Spring 
• O-Ring 

The OE TCC regulated apply bore in GM 4T65-E units wears, causing TCC signal (PWM) oil and TCC regulated apply oil to leak. The leakage lowers the apply pressure, which causes the torque converter clutch to slip. The Sonnax TCC regulated apply valve kit 84754-34K addresses TCC slip, code 741 and occasional ratio codes.

Symptoms:

Code P0741
Gear ratio codes
TCC slip

Cause:

Bore wear at the TCC apply valve allows regulated apply oil to exhaust.

Correction:

Sonnax design improvements aid durability and restore apply pressure to eliminate converter clutch slippage.

NOTE: It is recommended to check separator plate orifices in this area for contamination. Additionally, the TCC apply valve bore should be examined for wear with any TCC related concerns.

Required tool

Reamer 4T65E TCC-valve: 84754-TL3

Shiftvalve 2-3 4T60E

1994-later, Does not fit Geartronic® or TAPshift units

Material: Aluminium

OE 4T60-E shift valves have changed materials over the years, starting with steel, changing to silver-colored uncoated raw aluminum, and finally anodized aluminum. 4T60-E units can have a combination of these materials with the silver-colored uncoated raw aluminum being especially problematic due to scoring/scratching and intermittent sticking. It is highly recommended to replace all raw aluminum shift valves with the Sonnax hard-coat anodized replacements. These are drop-in replacements and do not require any machining. Valves also have applications in 4T60-E and 4T65-E.

Symptoms:

2-3 Shuttle
2nd Gear starts
Erratic shifts
No 3rd
No 4th
Temperature-sensitive shifts

Cause:

The non-anodized valves score and seize in the bore

Correction:

These valves are hard anodized with annular grooves which eliminate surface wear and reduce valve hang-up.

NOTE: This valve does not fit in 4T60-E '93-earlier valve bodies and should not be used in the 4T65-E with Geartronic® or TAPshift units.

Shiftvalve 3-2 4T60E

Does not fit Geartronic® or TAPshift units

Material: Anodized Aluminium

OE 4T60-E shift valves have changed materials over the years, starting with steel, changing to silver-colored uncoated raw aluminum, and finally anodized aluminum. 4T60-E units can have a combination of these materials with the silver-colored uncoated raw aluminum being especially problematic due to scoring/scratching and intermittent sticking. It is highly recommended to replace all raw aluminum shift valves with the Sonnax hard-coat anodized replacements. These are drop-in replacements and do not require any machining. Valves also have applications in 4T60-E and 4T65-E.

Symptoms:

2-3 Shuttle
2nd Gear starts
Erratic shifts
No 3rd
No 4th Temperature-sensitive shifts

Cause:

The non-anodized valves score and seize in the bore

Correction:

These valves are hard anodized with annular grooves which eliminate surface wear and reduce valve hang-up.

NOTE: This valve should not be used in the 4T65-E with Geartronic® or TAPshift units.

Shiftvalve 4T60E 4-3 manual

Material: Anodized Aluminium

OE 4T60-E shift valves have changed materials over the years, starting with steel, changing to silver-colored uncoated raw aluminum, and finally anodized aluminum. 4T60-E units can have a combination of these materials with the silver-colored uncoated raw aluminum being especially problematic due to scoring/scratching and intermittent sticking. It is highly recommended to replace all raw aluminum shift valves with the Sonnax hard-coat anodized replacements. These are drop-in replacements and do not require any machining. Valves also have applications in 4T60-E and 4T65-E.

Symptoms:

2-3 Shuttle
2nd Gear starts
Erratic shifts
No 3rd
No 4th
Temperature-sensitive shifts

Cause:

The non-anodized valves score and seize in the bore

Correction:

These valves are hard anodized with annular grooves which eliminate surface wear and reduce valve hang-up.

Valve 1-2 & Reverse Boost 4T60E

• Valve 
• Long Spring 
• Short Spring 
• Coiled Spring Pin 

Fits either of 2 locations

The continuous stroking of the 1-2 (forward) and reverse servo boost valves wear away at the valve bore, creating excess clearance and reduced apply pressures. This can lead to 1-2 band slippage, delayed engagements, 1-2 shift flares, and decreased reverse pressure. Sonnax has developed an oversized valve 84754-40K that will restore the hydraulic integrity and more than doubles the valve-to-bore contact area to prevent leakage.

Symptoms:

1-2 Band burned
1-2 Flare Delayed engagement
Low Reverse pressure

Cause:

These complaints may be caused by the continuous reciprocation of the 1-2 (forward) and reverse servo boost valves wearing the valve body bores.

Correction:

This oversized, hard-coat anodized aluminum valve restores hydraulic integrity, and has increased valve-to-bore contact to prevent leakage. This valve requires the use of a Sonnax reaming tool kit.

NOTE: This kit only contains one valve. If both bores need to be repaired, two kits are required.

Required tools:

Reamerkit 4T60E, 4T65E 1-2/Rev: 84754-TL2

TCC Valve 4T65E

• Valve 
• PTFE Seals (2) 1 extra
• Spring 
• O-Ring 

With PTFE seal

Symptoms:

Code P0741
Converter shudder
Falls out of lockup when hot
High TCC slip RPM
No lockup

Cause:

Continuous oscillation of the converter apply valve in the cast-aluminum bore causes bore wear that prevents the valve from stroking to the lock-up position.

Correction:

The Sonnax kit provides a positive seal to ensure proper valve stroke, and more valve support to prevent side loading that leads to wear.

Accumulator pin kit 4T65E

• Pins (10)
• Reamer 

Inconsistent shifts, high shift adapt numbers and burned clutches in a 4T65-E can all be traced back to worn accumulator pistons. Pin bore wear allows clutch apply pressure to exhaust into accumulator circuits and decrease clutch apply pressure.

Symptoms:

Burnt clutches
High shift adapt numbers
Inconsistent shift quality

Cause:

Worn 1-2 and 2-3 accumulator piston pin bore

Correction:

This oversized replacement accumulator pin restores the proper fit between the piston and the bore and allows re-use of the original aluminum piston.

Accumulator valve 2-3 4T65E

• Valve 
• Sleeve 

Fits GM units only.

To help control the 3rd clutch apply pressure and shift feel, a 2-3 accumulator piston and an accumulator valve and sleeve that regulate fluid pressure are used. The 2-3 accumulator valve and sleeve regulate line pressure using torque signal influence and direct 2-3 accumulator pressure to the spring side of the piston, controlling the 3rd clutch apply. Wear at the sleeve or valve can allow torque signal, 2-3 accumulator or line pressures to exhaust, resulting in various 2-3 shift complaints. Some early OE valves were not anodized, and are prone to significant wear and scratching.

Symptoms:

2-3 Shift concerns
Low line rise

Cause:

Wear of the 2-3 accumulator valve and/or sleeve allow loss of torque signal, 2-3 accumulator and/or line pressure.

Correction:

Install the Sonnax valve and sleeve kit that has upgraded materials, restores correct hydraulic clearances and is designed to prevent wear.

NOTE: For 4T65-E units installed in Volvo vehicles, use 2-3 accumulator valve kit 84754-64K.

Valvekit 1-2 Accumulator 4T65 OS

To help control the 2nd clutch apply pressure and shift feel in the 4T65-E, a 1-2 accumulator piston and accumulator valve regulating fluid pressure are used. The 1-2 accumulator valve regulates line pressure using torque signal influence and directs 1-2 accumulator pressure to the spring side of the piston, controlling the 2nd clutch apply. Wear at the bore or valve can allow torque signal, 1-2 accumulator or line pressures to exhaust, resulting in various 1-2 shift complaints. 

Symptoms:

1-2 Long
Flare shifts
Soft shifts & poor line rise

Cause:

Wear at the 1-2 accumulator valve and/or bore, allowing loss of torque signal, 1-2 accumulator and/or line pressure.

Correction:

Refurbish the worn bore and install the Sonnax oversized valve to restore correct hydraulic clearances.

Required tool:

Tool 1-2 Accumultator 4T65 OS: F-84754-TL57

Oversized valve 3-4 4T65E Volvo

• Valve 
• Spring 

Volvo only

To help control the 4th clutch apply pressure and shift feel, a 3-4 accumulator piston and an accumulator valve regulatingfluid pressure are used. The 3-4 accumulator valve regulates line pressure using torque signal influence, and directs 3-4 accumulator pressure to the spring side of the piston, controlling the 4th clutch apply. Wear at the bore or valve can allow torque signal, 3-4 accumulator or line pressures to exhaust, resulting in various 3-4 shift complaints.

Symptoms:

3-4 Concerns Soft shifts & poor line rise

Cause:

Wear at the 3-4 accumulator valve and/or bore, allowing loss of torque signal, 3-4 accumulator and/or line pressure.

Correction:

Refurbish the worn bore and install the Sonnax oversized valve to restore correct hydraulic clearances and shift control.

Oversized TCC apply kit

• Valve 
• PTFE Seal 
• Spring 

1997 & later with aluminium valve

Symptoms:

Code 39, 740, 1870
Falls out of lockup when hot
Low cooler flow
Overheated converter
Shudder

Cause:

Wear of the TCC apply valve bore allows leakage of TCC signal oil to exhaust and the apply valve to move into the TCC release position.

Correction:

Wear of the TCC apply valve bore allows leakage of TCC signal oil to exhaust and the apply valve to move into the TCC release position.

Required tool:

84754-TL5

TCC Apply Valve Kit

• Valve 
• PTFE Seal 
• Spring 

1997 & later with aluminum valve

Symptoms:

Code 39, 740, 1870
Falls out of lockup when hot
Low cooler flow
Overheated converter Shudder

Cause:

Wear of the TCC apply valve bore allows leakage of TCC signal oil to exhaust and the apply valve to move into the TCC release position.

Correction:

Wear of the TCC apply valve bore allows leakage of TCC signal oil to exhaust and the apply valve to move into the TCC release position.

TCC Relief Valve

Symptoms:

Loss of lube oil
Low cooler flow
Overheating
Repeated converter failure
TCC slip

Cause:

Relief valve doesn't break at low enough pressure.

Correction:

The Sonnax relief valve will crack and flow at a sufficient rate, which will eliminate TCC piston deflection caused by high pressure.

Sleeve 4T60E 1-2 servo bore

• Sleeve 
• Piston 
• Seal 
• Spring Spacer 

1-2 or Reverse servo

Normal operation takes it toll on the 1-2 or reverse servo bore in 4T60 & E units as repeated oscillation eventually wears or scores the bore. Sonnax has designed a 1-2 or reverse servo and sleeve kit, 84791-01K, that contains everything necessary to salvage the case.

Symptoms:

2-3 Flare Delayed
Forward only in OD range
Delayed Reverse
Low line pressure
No 3rd
Reverse slip

Cause:

The 1-2 or reverse servo bore can become worn or scored from repeated oscillation during normal operation.

Correction:

This 1-2 or reverse servo & sleeve kit salvages cases with a worn or scored servo bore and improves reverse, 2-3, 3-2 shift control.

Pump slide pivot pin (solid)

Package quantity: 5

Symptoms:

High line pressure Low line pressure

Cause:

Load conditions and pin wear can reduce available output and lower line pressure, resulting in reduced shift and engagement quality when hot.

Correction:

Replace OE pin with correct style Sonnax pin.

Pump slide pivot pin (grooved)

Package quantity: 5

Symptoms:

High line pressure Low line pressure

Cause:

Load conditions and pin wear can reduce available output and lower line pressure, resulting in reduced shift and engagement quality when hot.

Correction:

Replace OE pin with correct style Sonnax pin.

Side cover repair plate

For stamped steel side covers

Vehicles with a 4T60 or 4T60-E transmission often have oil leakage at the side cover to channel plate inner gasket. The time-consuming and difficult task of replacing the inner side cover gasket often does not eliminate the leakage. The failure of this gasket can be caused by 4th clutch heat, side cover corrosion, and/or potential crushing or splitting of the gasket when the side cover pan nuts are torqued. We offer a leak repair plate, 84995-01, designed to fix the leak without removing the side cover or replacing the failed gasket.

Symptoms:

Leakage of oil at side cover to channel plate inner gasket

Cause:

4th clutch heat, side cover corrosion, crushing or splitting of the gasket when the side cover pan nuts are torqued.

Correction:

Fix the leak without removing the side-cover or replacing the failed gasket with this leak repair plate.

NOTE: For use with stamped steel side cover.

FITS: 4T60E 91-Up

FEATURES: Corrects/Prevents/Reduces: Light throttle converter shudder.

Contains hardened pins and “Tuff” accumulator piston seals to reduce clutch failure due to pin and seal wear, 3rd clutch seal is self expanding. Includes PWM valve, lock-up regulator valve & bushings.

Special Instructions: Does not require transmission removal for proper installation.

SC-4T60E

Fits '93–'96 units

Sonnax Sure Cure Kits combine the best Sonnax products into one box, offering rebuilders a convenient and cost-effective way to address common transmission problems.

These kits simplify ordering, stocking and estimating job costs, and include easy-to-read, step-by-step instructions that cover the inspection and repair of the most critical areas of the unit, and even a reference list of rebuilding specifications.

SC-4T60E-1

Fits 1997 and later units

Sonnax Sure Cure kit SC-4T60E-1 is a comprehensive reconditioning package for GM 4T60-E PWM units featuring the best Sonnax products developed to help rebuilders restore and enhance transmission performance. Sure Cure components are the same Sonnax parts sold individually to resolve common valve body complaints as well as other transmission problems.

The high-quality Sonnax parts in each Sure Cure kit repair worn areas and protect the transmission against future damage. Each kit comes with easy-to-read, step-by-step installation guide that covers the inspection and repair of the most critical areas of the valve body.

3-4 Accumulator Piston

It is common to have poor 3-4 shifts, no 4th gear or a burned 4th clutch in 4T65-E units. This can be caused by excessive wear at the 3-4 accumulator piston pin bore, which allows 4th clutch oil to exhaust and can result in harsh 4th, no 4th gear or a burned 4th clutch. Pin bore wear also reduces 3rd clutch pressure during 3-4 shift. The 4th shift quality depends on the condition of the piston and accumulator valves. If the 4th accumulator piston seizes, the 4th shift will be very hard. The accumulator piston 84880M-01 restores accumulator pressure and eliminates cross leaks.

Symptoms:
3-4 Concerns
4th Clutch burned
No 4th
Soft 3rd

Cause:

Wear at the 3-4 accumulator piston pin or bore.

Correction:

The Sonnax piston is made from high grade billet aluminum to prevent wear and restores clearances at the pin.

Number of teeth: 32
Outside diameter: 4.399
overall thickness: 0.079

Number of teeth: 30

Outside diameter: 4.646

Overal thickness: 0.064

Number of teeth: 36

Outside diameter: 5.525

Inside diameter: 3.880

Overal thickness 0.068

Channel Plate Sleeve

OE does not service the 4T65-E channel plate sleeve as an individual part. In the past it was necessary to purchase a channel plate (case cover) assembly. We offer replacement through hardened sleeve 84596-01K.

Symptoms:

• Worn channel plate sleeve

Cause:

Drive sprocket, bearing failure cause channel plate (case cover) sleeve wear.

Correction:

Replace the worn channel plate sleeve with 4T65-E through-hardened replacement sleeve.