Description: Sonnax reverse servo spacer kit 34528-01K is a simple, low-cost way to add durability to the GM 4L80-E and 4L85-E transmissions and eliminates the need to retrofit early design reverse servo pistons into late units.Due to a design change in 1996, the reverse servo piston commonly breaks because it is stressed more than early servos. Installation of this Sonnax kit reduces piston stress by increasing the contact area between the aluminum piston and spacer, and incorporating a cushion spring washer. The new contact area is over two times the original and the pressure between the piston and the spacer is reduced by 60%. This Sonnax kit easily installs during assembly and does not require machining or other modifications. Excessively high line pressure in Reverse is directly related to boost valve wear and cross-leaks into the EPC oil circuit. Increased contact area reduces pressure between apply pin and piston by 60%Added Belleville spring washer reduces shock on pistonNo machining necessary, drop-in componentsMaximum durability for minimal cost
Price: 39.2 USD
Location: Hazel Park, MI
End Time: 2025-01-25T20:15:33.000Z
Shipping Cost: 0 USD
Product Images
Item Specifics
Return shipping will be paid by: Buyer
Returns Accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money Back
Return policy details:
California Prop 65 Warning: WARNING: Cancer and reproductive harm. www.p65warnings.ca.gov
OE/OEM Part Number: 34528-01K
Performance Part: No
Universal Fitment: No
Manufacturer Part Number: 34528-01K
Brand: Sonnax
Type: Rear Servo Spacer Kit
Items Included: Sonnax Transmission Components
