Sonnax GM 4L60 Transmission

Internal

Smart-Tech® Clutch Kit 77734-01K

Recommended clutch pack for Smart-Tech input housing kits.

2.84 Ratio Input Carrier Kit 77284-K

3-4 Clutch Boost Spring 77763-01

Fits '88-later units.

Helps cure:

3-4 Clutch boost spring collapse
3-4 Clutch boost springs inefficient when overheated

3-4 Clutch Boost Spring & Retainer Assembly 8667424

'88-Later

Helps cure:

3-4 Clutch failure

Apply Plate & Seal Service Kit 77733-06SVC

Batwing Washer 77731-05

Fits 4-pinion rear planetary.

Helps cure:

Planetary failure
Planetary wear

Bearing Kit SBK-G12

Fits '82-later

Helps cure:

Bearing noise
Bearing failure

Governor 731

250, 305 & 350 Gas engines

Helps cure:

Shift concerns

Governor 730

Gas

Helps cure:

Shift concerns

Governor Gear Kit 702

Color: Blue

Helps cure:

Shift concerns

Heavy Duty 3-4 Clutch Backing Plate Kit 74140-01K

Requires ’87-later housing, snap ring and ring gear and ’91-later 3-4 apply ring stamped with number “7”, measuring 3.671–3.682" in height.

Heavy Duty Input Shaft 77733-10SB

For ’85-later units with 298mm converter, 30-spline input shaft. For ’82–’84 units with 27-spline input shaft, converter and stator shaft will need to be updated to ’85-later design.

Heavy Duty Overrun Clutch Hub 74574-HD

Heavy Duty Reaction Shaft Kit 74602-01K

Universal kit, fits all years and all input carrier styles.

Input Drum Reinforcement Kit 77733-02K

Sleeve & Seal

Input Housing Forward Sleeve Kit 77733-52K

Requires Sonnax overrun sleeve and compatible overrun piston. See instructions for details.

Input Housing Overrun Sleeve Kit 77733-51KA

Pinion Gear 77731-01

Rear Planetary

Helps cure:

Planetary failure
Planetary wear

Pinion Needle Roller 77731-03

Fits 4-pinion rear planetary.

Helps cure:

Planetary failure
Planetary wear

Pinion Pin 77731-02K

Fits 4-pinion rear planetary.

Helps cure:

Planetary failure
Planetary wear

Planetary Rebuild Kit 77731-RK

Fits 4-pinion rear planetary

Helps cure:

Planetary failure
Planetary wear

Rear Planetary Pinion Pin 77732-02

4- & 5-Pinion rear planetary

Helps cure:

Planetary failure
Planetary wear

Round Washer 77731-04

4-Pinion rear planetary

Helps cure:

Planetary failure
Planetary wear

Shim 77409-15

Front bearing Endplay

Material: Steel
Inner Dia.: 1.240"
Outer Dia.: 1.815"
Thickness: 0.015"

Helps cure:

Excess endplay
Driveline noise

Shim 77406-10

Rear bearing

Material: Steel
Thickness: 0.010"
Inner Dia.: 1.725"
Outer Dia.: 2.310"

Helps cure:

Excess endplay
Driveline noise

Smart-Tech® Input Housing Kit 77733-06KA

Does not include input shaft.

Smart-Tech® Input Housing Kit with Heavy Duty Input Shaft 77733-10KB

For ’85-later units with 298mm converter, 30-spline input shaft. For ’82–’84 units with 27-spline input shaft, converter and stator shaft will need to be updated to ’85-later design.

SmartShell® Heavy Duty Reaction Shell Kit 77749-02K

Heavy duty reacion shell

Wide Reaction Sun Gear Bushing 77010-01

May not work in some late-production sun gears with OE finish-in-place bushings. Sun Gear, Wide

Material: Steel-backed bronze
Bushing Style: Precision
Housing Bore: 1.706"
Shaft Dia.: 1.575"
Width: 0.600"

Helps cure:

Bushing failure
Reaction carrier shaft damage

Pump

Bushing 77005T

Pump

Bushing Style: Precision
Material: Bimetal, PTFE-lined

Helps cure:

Worn pump bushing

Elevated Pressure Main Pressure Regulator Spring 77917-08

Helps cure:

Low base line pressure

Line Pressure Booster Kit 700R4-LB1

Oversized Pressure Regulator Valve 77917-06

Helps cure:

Erratic line pressure
Low line rise
Clutch slippage
Excess pump noise
3-4 Clutch failure

Tooling:

77917-TL
77917-TLC

Pump Slide Pivot Pin 65797

Helps cure:

Low line pressure
High line pressure

Pump Slide Spring 77722-01K

Replaces 2 OE springs

Pump Spring Spacer 77917-RV

Helps cure:

Erratic line pressure

Pump Vane 1280

Helps cure:

Lost or damaged component

Rear Stator Support Bushing 77002B

Wider than OE Rear Stator Support

Bushing Style: Precision
Material: Steel-backed lead/bronze alloy
Width: 0.510"
Inner Dia.: 1.250"
Housing Bore: 1.360"
Shaft Dia.: 1.237"

Helps cure:

Bushing wear
Bushing failure

Rear Stator Support Bushing 77002BT-01

Rear Stator Support

Bushing Style: Precision
Material: Bimetal, PTFE-lined
Housing Bore: 1.360"
Shaft Dia.: 1.237"
Assembled Height: 0.510"
Width: 0.510"

Replacement Seal 77805-S-25

For TCC apply valve kits 77805-K and 77805E-K.

Material: PTFE

Helps cure:

Lost or damaged component

Reverse Boost Valve Kit K77898A

Large Ratio, Factory Style, No O-Rings

Helps cure:

Low Reverse boost
Delayed Reverse
Low line pressure
Poor upshift in manual low

Reverse Boost Valve Kit K77898

Large Ratio, O-Ring Style

Helps cure:

Low Reverse boost
Delayed Reverse
Low line pressure
Poor upshift in manual low

Stator Support Bushing 35007A

‘84-Later

Bushing Style: Precision
Material: Steel-backed copper alloy
Width: 0.500"
Housing Bore: 1.121"
Inner Dia.: 1.004"
Shaft Dia.: 1.002"

Helps cure:

Bushing wear
Bushing failure

Stator Support Shaft Kit 77918S-K

245mm or 298mm Converter, non-reluctor style, universal bolt pattern

Helps cure:

Overheated converter
Worn splines
TCC apply & release concerns

TCC Apply Valve Kit 77805-K

Fits non-PWM units only.

Helps cure:

No lockup
Falls out of lockup when hot
Fluid blown out fill tube
Lockup immediately after 2nd gear

TCC Solenoid Snout Kit 77942-01K

Helps cure:

TCC apply concerns
Overheated converter
Loss of lube oil

TV Boost Valve Kit 77917-02K

.423" Bore Dia., Factory Style

Helps cure:

Soft slide shifts
3-4 Clutch burned
Reduced band life

TV Boost Valve Kit 77917-471

.471" Bore Dia., O-Ring Style

Helps cure:

Soft slide shifts
3-4 Clutch burned
Reduced band life

TV Boost Valve Kit 77917-500

.500" Bore Dia., O-Ring Style

Helps cure:

Soft slide shifts
3-4 Clutch burned
Reduced band life

TV Boost Valve Kit 77917-04K

.500" Bore Dia., Factory-Style Sleeve

Helps cure:

Soft slide shifts
3-4 Clutch burned
Reduced band life

TV Boost Valve Kit 77917-03K

.471" Bore Dia., Factory Style Sleeve

Helps cure:

Soft slide shifts
3-4 Clutch burned
Reduced band life

Valve Body (View Valve Body Layout Diagram)

Accumulator Valve Train Kit 77777M-K

Fits "M" version valve trains in heavy weight vehicles, .341" dia. In 4L60, fits '87-later auxiliary valve body styles only.

Helps cure:

1-2 Bang at light throttle
Reduced 2-4 band life

Accumulator Valve Train Kit 77777L-K

Fits "L" version valve trains in light/medium weight vehicles, .330" dia. Fits 4L60 '87-later auxiliary valve body styles only.

Helps cure:

1-2 Bang at light throttle
Reduced 2-4 band life

Checkball 10000-10

Imidized Plastic, .312" Dia.

Material: Imidized Plastic
Dia.: 0.312"

Checkball 10000-08

Material: Imidized Plastic
Dia.: 0.250"

Helps cure:

Lost or damaged component

Clip 77754-08

Height: 1.010"
Width: 0.520"

Helps cure:

Lost or damaged component

Oversized Throttle Valve 77968

Not compatible with early '82–'90 aluminum sleeve units.

Helps cure:

Low line rise
3-4 Clutch & band failure

Tooling:

77968-RM

Shortened TV Link 77872-01

Helps cure:

Low line rise
Soft shifts
3-4 Clutch failure
3-4 Band failure

TV Plunger Spring 77968-01K

Helps cure:

Low throttle pressure
Low line pressure

The Sure Cure® Kit SC-4L60

Helps cure:

3-4 Clutch failure
Burnt clutches & bands
Excess pump noise
Low line pressure
Low line rise
Low Reverse boost
2-3 Shift feel poor
Early upshifts
Soft upshifts
Soft shifts
Slide shifts
Delayed Reverse

Tooling:

77917-TL

Throttle Valve 77968-02

Fits both aluminum sleeved and non-sleeved units.

Helps cure:

Low line rise
Pin bore wear
Early upshifts
Soft upshifts
Premature 3-4 clutch failure

Throttle Valve Plunger Kit 77966-94MK

Helps cure:

Low line rise
Early upshifts
Soft upshifts
Premature 3-4 clutch failure
Low line pressure

Throttle Valve Plunger Valve Kit 77966-94K

OE plungers with code 94

Helps cure:

Low line rise
Early upshifts
Soft upshifts
Premature 3-4 clutch failure
Low line pressure

Case

1-2 or 3-4 Accumulator Spring 74926

Helps cure:

Soft shifts

3-4 Accumulator Sleeve Kit 77998-01K

Helps cure:

Case damage
Scored accumulator bores
Worn accumulator bores

3rd Accumulator Checkball & Seat 74480D

Helps cure:

2-3 Soft
2-3 Flare
3-4 Clutch burned
2-4 Band burned
3-2 Bind-up
2-3 Bind-up

Enhanced Performance Accumulator Spring 77704S

Pinless Accumulator Piston Kit 77998-03K

In 200-4R applications, this kit can only be used in the 3-4 accumulator location.

Helps cure:

Poor shift quality
Burnt clutches & bands

Replacement Seal Kit 77998-03SK

Seals Fit 77998-03K Piston

Helps cure:

Lost or damaged component

Servo Release Check Valve Kit 77701-076

2nd Gear Servo Release

Helps cure:

Reduced 3-4 clutch life
2-3 Shift feel poor
3-2 Bind-up

Servo/Band

2nd Gear "Corvette" Ratio Servo Kit 77701-04K

.74 Ratio

2nd Gear Servo Kit 77701-02K

.63 Ratio

2nd Gear Super Hold Servo Kit 77911-03K

.87 Ratio

4th Gear Super Hold Dual Servo Kit 77767K

Extra Wide Intermediate Band 77700-01

Red Material

Color: Red

Extra Wide Intermediate Band 77700-01K

Kevlar^® Material

Metal Clad Viton® Seal 77911-02

Press in

Material: Fluorocarbon
Housing Bore: 0.750"
Shaft Dia.: 0.500"

Helps cure:

2-3 Concerns
2-4 Band failure

Oversized Servo Pin Kit 77787-03K

Helps cure:

Pin bore wear
No 4th
Burnt band (GM)
2-3 Bind-up
3-4 Clutch failure

Tooling:

77787-RM3

Replacement Seal Kit 77701-04SK

For 77701-04K

Replacement Seal Kit 77767K-SK

Replacement Seal Kit 77911-03SK

For 77911-03K 2nd Gear Superhold Servo

Servo Pin Kit 77787-02K

Extra long pin with seals

Other

Carburetor TV Linkage Corrector Kit AS5-05K

Fits Edelbrock®-style throttle arm

Carburetor TV Linkage Corrector Kit AS4-04K

Fits Holley® aftermarket-style throttle arm.

Forward Piston Installation Tool 77764-INSTL

Reamer 77787-RM3

TV Cable Corrector Kit AS1-01K

Throttle Cable & TV Cable Bracket AS6-01

Fits Holley^® carburetors.