Chevrolet Silverado / GMC Sierra. Manual — part 1160

J 36850 or an equivalent. See Special Tools.

Fig. 500: View Of Valve Body, Manual Valve Link & Manual Valve
Courtesy of GENERAL MOTORS CORP.

NOTE:

Be sure all solenoids are installed with the electrical
connectors facing the non-machined (cast) side of the valve
body; otherwise, the solenoids will bind against the
transmission case as the valve body bolts are tightened and
damage may occur.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

5. Install the valve body over the J 25025-5 , and connect the manual valve link to the manual

valve. See Special Tools.

6. Install 2 valve body bolts to hold the valve body in place.

7. Remove the J 25025-5 . See Special Tools.

Fig. 501: View Of Valve Body Bolts
Courtesy of GENERAL MOTORS CORP.

8. Install the valve body bolts (62) that are shown only.

9. Finger tighten the bolts.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

Fig. 502: Inspection Areas On Transmission Fluid Pressure (TFP) Manual Valve
Position Switch Assembly
Courtesy of GENERAL MOTORS CORP.

10. Inspect the transmission fluid pressure (TFP) manual valve position switch assembly for the

following conditions:

Damage

Debris

Damaged or missing O-rings

Cracked connector

Loose electrical terminals

Poor terminal retention

Sediment in switch membrane

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

Fig. 503: TFP Manual Valve Position Switch Retaining Bolts
Courtesy of GENERAL MOTORS CORP.

11. Install the TFP manual valve position switch (69) and bolts (62, 70).

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado