• 4T65-E

Sonnax hydraulic line pressure booster kits contain stronger pressure regulator springs and large ratio boost valves designed to work together to provide progressi...Read More

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• 4T65-E

A worn valve or valve body bore can result in incorrect pressures in the transmission, which may lead to poor performance or failure of the transmission. With the ...Read More

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• 4T60-E
• 4T65-E

Vehicles with GM 4T60-E and 4T65-E transmissions may exhibit case wear at the forward band servo pin bore. The OE pin is also shorter than necessary. These issues ...Read More

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• 4T60-E
• 4T65-E

Sonnax lip seal 84965-SK is for use when servicing units previously built with Sonnax 3rd clutch piston kit 84965-01K.

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• 258mm LU (4L60-E, 5L40-E)
• 258mm LU (4T65-E)
• 265mm LU (4T60-E, 4T80-E)
• 4L80-E (Dual Stator)

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• 4T65-E
• Enclosed pump slide pivot pin does not fit late-style, 3-piece pump.

Sonnax Sure Cure kit SC-4T65E, fully compatible with all GM 4T65-E units, is a comprehensive reconditioning package featuring the best Sonnax products developed to...Read More

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• 4T60-E
• 4T65-E
• Fits ’94-later 4T60-E. Does not fit 4T65-E Geartronic® or Tapshift® units.

GM 4T60-E and 4T65-E shift valves have changed materials over the years, starting with steel, changing to silver-colored uncoated raw aluminum, and finally anodize...Read More

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• 4T60-E
• 4T65-E
• Fits ’94-later 4T60-E. Does not fit 4T65-E Geartronic® or Tapshift® units.

GM 4T60-E and 4T65-E shift valves have changed materials over the years, starting with steel, changing to silver-colored uncoated raw aluminum and finally anodized...Read More

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• 4T60-E
• 4T65-E

Tool Kit for 84754-40K (4T60-E & 4T65-E)

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• 4T65-E

OE does not service the GM 4T65-E channel plate sleeve as an individual part. In the past it was necessary to purchase a channel plate (case cover) assembly. Sonna...Read More

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• 4T60
• 4T60-E
• 4T65-E
• Fits either of 2 locations

In GM 4T60, 4T60-E and 4T65-E units, the continuous stroking of the 1-2 (Forward) and Reverse servo boost valves wear away at the valve bore, creating excess clear...Read More

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• 4T60-E
• 4T65-E

The flexible hose for the differential lube tube line softens as temperature increases in GM 4T60-E and 4T65-E units, causing pressure in the line to blow the stee...Read More

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• 4T65-E

P1811 code or a slip/shudder condition can indicate a pressure control problem in the GM 4T65-E. A worn or sticking torque signal regulator valve and bore reduces ...Read More

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• 4T60
• 4T60-E
• 4T65-E

Vehicles with GM 4T60, 4T60-E and 4T65-E transmissions may exhibit multiple line pressure and converter-related problems due to excess wear in the main pressure re...Read More

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• 4T65-E

To help control the 2nd clutch apply pressure and shift feel in the GM 4T65-E, a 1-2 accumulator piston and accumulator valve regulating fluid pressure are used. T...Read More

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• 258mm LU (4T65-E)

Sonnax splined insert GM-I-14HS replaces worn or damaged pump drive inserts in GM 258mm LU (4T65-E) converters.

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• 4T65-E
• Calibrated to prevent excessive apply pressure,

GM 4T65-E transmissions often suffer converter failure during high line pressure conditions such as max adapts or various codes due to excess apply pressure. The t...Read More

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• 4T65-E
• 1-2 & 2-3 locations

Inconsistent shifts, high shift adapt numbers and burned clutches in a GM 4T65-E can all be traced back to worn accumulator pistons. Pin bore wear allows clutch ap...Read More

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• 4T65-E
• Fits GM units only.

To help control the 4th clutch apply pressure and shift feel, a 3-4 accumulator piston and an accumulator valve regulating fluid pressure are used in GM 4T65-E uni...Read More

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• 4T65-E
• 1-2 & 2-3 locations

Inconsistent shifts, high shift adapt numbers and burned clutches in a GM 4T65-E can all be traced back to worn accumulator pistons. Pin bore wear allows clutch ap...Read More

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• 4T65-E

The OE actuator feed limit (AFL) valve routes regulated line pressure to the pressure control solenoid and the 1-2, 3-4 shift signal circuit in GM 4T65-E units. We...Read More

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• 4T65-E

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, ...Read More

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• 4T65-E

Vehicles with GM 4T65-E transmissions often exhibit such problems as soft upshifts (especially 1-2), delayed Reverse and low line rise. This can be traced to wear ...Read More

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• 4T65-E

It is common to have poor 3-4 shifts, no 4th Gear or a burned 4th clutch in GM 4T65-E units. This can be caused by excess wear at the 3-4 accumulator piston pin bo...Read More

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• 4T65-E
• Fits GM units only. Not for use in Volvo applications.

To help control the 3rd clutch apply pressure and shift feel in GM 4T65-E units, a 2-3 accumulator piston and an accumulator valve and sleeve that regulate fluid p...Read More

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