Automatic Transmission - 4L80-E/4L85-E (Introduction, Service & Replacement): Overhaul Chevrolet Silverado 3500

Third and Fourth Clutch Accumulator Disassembly

1. Remove the 3rd clutch accumulator piston (2).
2. Remove the 3rd clutch accumulator piston seals (1, 3).
3. Remove the 4th clutch accumulator piston pin retainer ring (5).
4. Remove the 4th clutch accumulator piston (4) and pin (2) from the accumulator housing (1).
5. Remove the 4th clutch accumulator piston pin (2) from the accumulator housing (1).
6. Remove the 4th clutch accumulator piston seal (3) from the accumulator housing (1).

Scheme 420

1. Install the 3rd clutch accumulator piston inner (3) and outer (1) seals. Lubricate the 3rd clutch accumulator piston seals (1, 3) with DEXRON® III automatic transmission fluid.
2. Install the 3rd clutch accumulator piston (2).
3. Install the 4th clutch accumulator piston seal (3). Lubricate the 4th clutch accumulator piston seal (3) with DEXRON® III automatic transmission fluid.
4. Assemble the 4th clutch accumulator piston pin (2) with the 4th clutch accumulator piston (4).
5. Install the 4th clutch accumulator piston assembly into the accumulator housing (1).
6. Install the 4th clutch accumulator piston pin retainer ring (5) onto the 4th clutch accumulator piston pin (2).

Scheme 421

1. Install J 25025 into the valve body bolt hole where the manual shaft detent roller and spring is mounted.
2. Install the valve body gasket (2) onto the accumulator housing (1).
3. Install the valve body spacer plate (3) onto the valve body gasket (2).
4. Install the third and fourth clutch accumulator housing gasket (3).
5. Install the third clutch accumulator piston spring (1). This spring is the longer of the two springs.
6. Install the fourth clutch accumulator piston spring (4).
7. Install the third and fourth clutch accumulator housing assembly (5) onto the control valve body assembly (2).
8. Install the six accumulator housing bolts (6). Start the bolts finger tight and work towards the opposite end.
9. Tighten the accumulator housing bolts sequentially. Tighten: Tighten the bolts to 11 N.m (97 lb in).
10. Remove the J 25025 .
11. Install the valve body. Refer to «Valve Body and Pressure Switch Replacement»(ref-184171-S11384368412005082200000) .

Scheme 422

1. Remove the transmission filter. Refer to «Automatic Transmission Fluid/Filter Replacement»(ref-184171-S26501914032005082200000) .
2. Remove the rear servo from the transmission case in the following order: 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)