Chevrolet Silverado / GMC Sierra. Manual - part 971
4. Align shift valve body assembly (1) with main valve body locating pins (3).
5. Install the shift valve body assembly onto the separator plate.
Fig. 444: Shift Valve Body Retaining Bolts
Courtesy of GENERAL MOTORS CORP.
6. Position the control valve assembly on the work table so that the main valve body is facing
up.
7. Install 11 bolts (1) retaining the valve bodies together.
NOTE:
Refer to Fastener Notice .
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Tighten: Tighten the bolts to 12 N.m (108 lb in).
Fig. 445: Locating Shift Solenoid
Courtesy of GENERAL MOTORS CORP.
8. Position the control valve assembly on the work table so that the shift valve body is up.
9. Install the solenoid O-ring (4) onto the SS1 (5).
10. Install the solenoid O-ring (3) onto the SS1 (5).
11. Align the SS1 (5) so that the electrical connector points away from the nearest locating pin
and is parallel to the separator plate as shown.
12. Install the solenoid retainer (2).
IMPORTANT:
O-ring (4) is slightly larger than O-ring (3).
P/N 29536833 is printed on the shift solenoid 1 (SS1) (5).
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 446: Identifying Pressure Control Solenoids
Courtesy of GENERAL MOTORS CORP.
13. Position the control valve assembly on the work table so that main valve body (16) is facing
up.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
14. Install the solenoid O-ring (14) onto the PCS1 (15).
15. Install the solenoid O-ring (8) onto the PCS2 (9).
16. Install the spring (10), PCS1 trim valve (11), spring (12), and trim gain valve (13).
17. Install the spring (5), PCS2 trim valve (6) and trim gain valve (7).
18. Install PCS1 (15) so that the electrical connection faces up. Do not seat the solenoid.
19. Install PCS2 (9) so the electrical connection faces up. Do not seat the solenoid.
20. Align 2 accumulator plugs (3) so that the spring bores face up.
21. Install 2 accumulator plugs (3) and 2 accumulator springs (2).
22. Push PCS1 and PCS2 into the bores until the solenoids seat.
23. Align the PCS retaining bracket (1) with main valve body locating pin (4).
24. Install the PCS retaining bracket (1) so that PCS1 and PCS2, the accumulator plugs, and the
accumulator springs are retained against the valve body.
IMPORTANT: P/N 29541895 is printed on the pressure control solenoid 1
(PCS1).
IMPORTANT: P/N 29541896 is printed on the pressure control solenoid 2
(PCS2).
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado