• 4L60-E
• 4L65-E
• Early style, .490" dia., increased ratio, O-ring style

GM 4L60-E and 4L65-E transmissions frequently have poor line rise, which can result in 3-4 clutch, 2-4 band failure or poor shift quality. The duty cycle of the EP...Read More

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• 4L60-E
• 4L65-E
• Early style, .470" dia., OE ratio, O-ring style

GM 4L60-E and 4L65-E transmissions frequently have poor line rise, which can result in 3-4 clutch, 2-4 band failure or poor shift quality. The duty cycle of the EP...Read More

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• 4L60-E
• 4L65-E
• 4L70-E

GM 4L60-E, 4L65-E and 4L70-E transmissions often have trouble shifting into or holding 4th Gear due to excess wear in the sequence valve bore. This wear allows vit...Read More

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• 4L60-E
• 4L65-E
• 4L70-E
• 4L80-E
• 4L85-E
• For use with early-style ('92–'02) EPC solenoid in late-style (’03-later) units, solenoid not included.

GM 4L60-E, 4L65-E, 4L70-E, 4L80E-, 4L85-E  transmissions have both early- and late-style EPC solenoids. The early-style (’92-’02) proved to be more reliable than t...Read More

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• 4T40-E
• 4T45-E

In GM 4T40-E and 4T45-E units, the boost valve assembly is activated by torque signal pressure from the pressure control solenoid and reverse pressure to aid in ad...Read More

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• 4L60-E
• 4L65-E
• 4L70-E

In GM 4L60-E, 4L65-E and 4L70-E units, the AFL valve is a solenoid feed regulator valve that feeds the EPC solenoid and shift solenoids. The OE AFL valve design ha...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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• 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-E
• 4L65-E
• 4L70-E
• Late style, .472" dia., OE ratio, O-ring style

GM 4L60-E, 4L65-E and 4L70-E transmissions frequently have poor line rise, which can result in 3-4 clutch, 2-4 band failure or poor shift quality. The duty cycle o...Read More

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• 4L60-E
• 4L65-E
• 4L70-E
• Late style, .421" dia. OE ratio, O-ring style

GM 4L60-E, 4L65-E and 4L70-E transmissions frequently have poor line rise, which can result in 3-4 clutch, 2-4 band failure or poor shift quality. The duty cycle o...Read More

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• 4L60-E
• 4L65-E
• 4L70-E
• Fits '97-later PWM units. Built-in anti-drainback valve.

The plastic OE torque converter clutch solenoid snouts are prone to breakage causing them to leak oil that should be directed to the converter clutch apply valve. ...Read More

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• 4L60-E
• 4L65-E
• 4L70-E
• Dual-seal design

In GM 4L60-E, 4L65-E and 4L70-E units it is common for the plastic Forward accumulator piston to wear or crack. This causes a loss of fluid, resulting in delayed e...Read More

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• 4L60-E
• 4L65-E
• 4L70-E
• 4L60-E '97-earlier only, non-EC3 units

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

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• 200-4R
• 4L60
• 4L60-E
• 4L65-E
• 4L70-E
• 5L40-E
• 5L50-E
• Powerglide

Sonnax bushing 77005T is a direct replacement for the GM 4L60, 4L60-E, 4L65-E, 4L70-E pump bushing and an upgrade for the 5L40-E, 5L50-E and 200-4R. This bushing a...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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• 4L60-E
• 4L65-E
• 4L70-E
• Fits valve trains with sleeve stamp codes CX, DX or YZ only.

Vehicles with GM 4L60-E, 4L65-E or 4L70-E transmissions can experience light throttle shifts and poor shift quality as well as early 2-4 band failure. These proble...Read More

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

Sonnax now offers a high performance pump slide spring 77722-01K for the 4L60, 4L60-E, 4L65-E and 200-4R. In high performance applications, when engine speed excee...Read More

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• 4L60-E
• 4L65-E
• 4L70-E
• Fits either of two locations

The bore plug in GM 4L60-E, 4L65-E and 4L70-E units is held loosely in place with a coiled spring pin, allowing the opposing spring and oil pressure forces to stro...Read More

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• 4L60-E
• 4L65-E
• 4L70-E
• Early style

Line pressure booster kit 4L60E-LB1 fits early-style GM 4L60-E, 4L65-E and 4L70-E pumps. Sonnax hydraulic line pressure booster kits contain stronger pressure regu...Read More

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• 4L60-E
• 4L65-E
• 4L70-E
• Fits either of two locations.

In GM 4L60-E, 4L65-E and 4L70-E units, continuous oscillation of the Forward and Reverse abuse valves creates bore wear, allowing clutch feed pressure to exhaust. ...Read More

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• 4L60-E
• 4L65-E
• 4L70-E
• Fits PWM units only.

Vehicles with GM 4L60-E, 4L65-E and 4L70-E transmissions have numerous converter overheat lockup complaints. These include no lockup or lockup immediately after 2n...Read More

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• 4L60-E
• 4L65-E
• 4L70-E
• Late style

Line pressure booster kit 4L60E-LB2 fits late-style GM 4L60-E, 4L65-E and 4L70-E pumps. Sonnax hydraulic line pressure booster kits contain stronger pressure regul...Read More

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• 4L60
• 4L60-E
• 4L65-E
• 4L70-E
• Requires Sonnax overrun sleeve and compatible overrun piston. See instructions for details.

Input housing failure at the shaft and forward piston areas is common in high-torque 4L60, 4L60-E, 4L65-E and 4L70-E transmissions. Sonnax input housing forward sl...Read More

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