Chevrolet Silverado / GMC Sierra. Service manual — part 973

34. Install the solenoid O-ring (6) onto the TCC PCS (7).

35. Install the solenoid O-ring (5) onto the TCC PCS (7).

36. Install the TCC PCS spring (3).

37. Install the TCC PCS valve (4)

38. Align the TCC PCS (7) so that the electrical connection faces up.

39. Install the TCC PCS. Seat the solenoid.

40. Align the PCS retaining bracket (2) with the main valve body locating pin.

41. Install the PCS retaining bracket (2) so that the TCC PCS is against the valve body.

42. Install the bolt (1) retaining the PCS retaining bracket (2).

Tighten: Tighten the bolt to 12 N.m (108 lb in).

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Fig. 451: Main Mod Solenoid And Body Assembly
Courtesy of GENERAL MOTORS CORP.

IMPORTANT:

The solenoid O-rings are blue and white.

O-ring (3) is slightly larger than O-ring (2)

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

43. Install the O-rings (3 and 4) onto the MAIN MOD solenoid (6).

44. Install the MAIN MOD solenoid (6).

45. Install the MAIN MOD solenoid retainer (5) into the bottom of the valve body.

46. Install the MAIN MOD solenoid body assembly (2).

47. Install the 2 bolts (1) retaining the MAIN MOD solenoid valve body and the shift valve

body to the main valve body.

Tighten: Tighten bolts to 12 N.m (108 lb in).

P/N 29536833 is printed on the modulated main pressure
(MAIN MOD) solenoid.

IMPORTANT: Four bolts pass through the MAIN MOD solenoid valve body

to retain the control valve body assembly to the transmission
case. Install these bolts when installing the control valve
body assembly.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Fig. 452: TFP Switch And Reverse Signal Pipe
Courtesy of GENERAL MOTORS CORP.

48. Align the bolts holes and alignment tabs of the transmission fluid pressure (TFP) switch (1)

with the TFP switch holes in main valve body (3).

49. Install TFP switch (1) onto main valve body (3).

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado