• 4L60-E
• 4L80-E
• 4L85-E

Transmission cases made in 1994 and 1995 have neutral safety switch mounting holes but do not have the top mount shifter bracket holes. Sonnax shift cable mount br...Read More

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• 200-4R
• 4L60
• 4L60-E
• Fits non-PWM units only.

Vehicles with GM 200-4R, 4L60 and 4L60-E transmissions have numerous converter overheat lockup complaints. These include no lockup or lockup immediately after 2nd ...Read More

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• 200-4R
• 4L60
• 4L60-E
• 4L65-E
• 4L70-E

High-speed steel reamer tool Kit for 77917-06, 77917-07

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• 4L60-E
• 4L65-E
• 4L70-E

A worn OE pressure regulator valve can be detected in two ways. The first is a dynamometer test that reveals low line pressure during boost conditions (look for 50...Read More

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• 4L60
• 4L60-E
• 245mm or 298mm Converter, non-reluctor style, universal bolt pattern

Sonnax stator support shaft 77918S-K kit for GM 4L60 and 4L60-E units eliminates sleeve rotation by mechanically fastening the sleeve in place with a set screw, fu...Read More

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• 4L60
• 4L60-E
• 4L65-E
• 4L70-E
• TH350
• TH350C
• Rear bearing

Sonnax has designed .010" thick rear endplay shim 77406-10 to allow adjustment to the total and top unit endplay in GM TH350, TH350C and 4L60 (700-R4)/4L60-E serie...Read More

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• 4L60
• 4L60-E
• 4L65-E
• 4L70-E

The 3-4 accumulator bore on GM 4L60 and 4L60-E series cases can become scored, resulting in the loss of 4th servo feed and 4th accumulator pressure. Scoring is cau...Read More

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• 4L60
• Fits both aluminum sleeved and non-sleeved units.

In GM 4L60 units, modifying or replacing the throttle valve is a common practice during rebuild, but these modifications and replacements often alter performance, ...Read More

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• 4L60
• 4L60-E
• 4L65-E
• 4L70-E
• 4-Pinion rear planetary

Sonnax round washer 77731-04 is a direct replacement for worn or damaged OE washers in four-pinion rear planetary assemblies in listed GM transmissions. The Sonnax...Read More

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• 4L60
• 4L60-E
• 4L65-E
• 4L70-E
• 2nd Gear Servo Release

Technicians would like to find a way to successfully extend the life of 3-4 clutches, and improve the 2-3 shift feel. They have been trying, with limited success, ...Read More

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• 4L60

In GM 4L60 units, the TV cable synchronizes engine throttle movement with TV plunger movement. If the cable is not readjusted to ensure proper line rise, the unit ...Read More

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• 4L60
• Not compatible with early '82–'90 aluminum sleeve units.

A low throttle boost condition is a common complaint in vehicles with a vehicles with GM 4L60 transmissions. This loss of throttle boost oil creates poor line rise...Read More

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• 4L60

Poor line rise or no detent downshifts can be common complaints in vehicles with a GM 4L60 (THM700-R4) transmission. The steel throttle valve plunger continuously ...Read More

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• 4L60
• 4L60-E
• 4L65-E
• 4L70-E
• Extra long pin with seals

The servo pin in Sonnax servo pin kit 77787-02K is longer than the longest OE pin in GM 4L60, 4L60-E, 4L65-E and 4L70-E applications. The extra length simplifies a...Read More

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• 200-4R
• 4L60
• 4L60-E
• 4L65-E
• 4L70-E

A common goal with GM 4L60-series transmissions is to increase pump volume or output, but a common problem is fluctuating pressure in Reverse. Sonnax pump spring s...Read More

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• 4L60-E
• 4L65-E
• 4L70-E
• Fits all years & '98-later EC3 units

In GM 4L60-E, 4L65-E and 4L70-E units, severe wear of the TCC regulator valve bore caused by oscillation of the OE valve allows regulated converter apply pressure ...Read More

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• 280mm LU (4L60-E) “VJCX”
• 300mm (4L60-E)
• 4L60-E (300mm), Single-Plate Performance Converter (Mounting Ring)

Sonnax 300mm performance converter mounting ring kit GM-RK-13 allows an early GM 245mm lockup core to be adapted for use in 4L60-E applications that originally cam...Read More

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• 200-4R
• 4L60
• Large Ratio, O-Ring Style

Vehicles with GM 200-4R and 4L60 transmissions often have problems with poor Reverse boost or upshifts in manual low. These are generally caused by a worn Reverse ...Read More

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• 200-4R
• 4L60
• .423" Bore Dia., Factory Style

A common problem in GM 200-4R and 4L60 transmissions is burned bands and/or 3-4 clutches. This failure can be reduced by eliminating throttle boost oil leakage. So...Read More

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• 200-4R
• 4L60
• .471" Bore Dia., Factory Style Sleeve

A common problem in GM 200-4R and 4L60 transmissions is burned bands and/or 3-4 clutches. This failure can be reduced by eliminating throttle boost oil leakage. So...Read More

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• 200-4R
• 4L60
• .500" Bore Dia., Factory-Style Sleeve

A common problem in GM 200-4R and 4L60 transmissions is burned bands and/or 3-4 clutches. This failure can be reduced by eliminating throttle boost oil leakage. So...Read More

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