Reverse Servo Replacement

Reverse Servo Replacement

Removal Procedure





1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
2. Remove the transmission oil pan and filter. Refer to Automatic Transmission Fluid and Filter Replacement (Removal and Replacement) .
3. Remove the rear servo assembly from the transmission case as follows:

* Cover bolts (6)
* Cover (5)
* Cover gasket (4)
* Bottom retaining clip (3)
* Servo piston (2)
* Outer ring oil seal (1)
* Inner ring oil seal (7)
* Accumulator piston (8)
* Piston seal (9)
* Washer (10)
* Servo spring (11)
* Servo spring retainer (12)
* Selective pin (13)
* Accumulator spring (14)




Installation Procedure





1. Install the rear servo assembly to the transmission case as follows:

* Accumulator spring (14)
* Selective pin (13)
* Servo spring retainer (12)
* Servo spring (11)
* Washer (10)
* Piston seal (9)
* Accumulator piston (8)
* Inner ring oil seal (7)
* Outer ring oil seal (1)
* Servo piston (2)
* Bottom retaining clip (3)
* Cover gasket (4)
* Cover (5)
* Cover Bolt (6)


Notice: Refer to Fastener Notice .

2. Install the cover bolts (61).

Tighten the bolts to 24 N.m (18 lb ft).

3. Install the transmission oil pan and filter. Refer to Automatic Transmission Fluid and Filter Replacement (Removal and Replacement) .
4. Lower the vehicle.
5. Fill the transmission to the proper level with DEXRON(R) VI transmission fluid. Refer to Transmission Fluid Check (4L80-E/4L85-E Automatic Transmission) .

Important: It is recommended that transmission adaptive pressure (TAP) information be reset.


Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned.


6. Reset the TAP values. Refer to Transmission Adaptive Functions (Transmission Adaptive Functions) .