Chevrolet Silverado / GMC Sierra. Service manual — part 1059

Fig. 129: View Of Transmission Fluid Pressure Switch & Bolts
Courtesy of GENERAL MOTORS CORP.

10. Remove the valve body bolts which retain the transmission fluid pressure switch to the valve

body.

11. Remove the transmission fluid pressure switch.

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

Fig. 130: Inspection Areas On Transmission Fluid Pressure (TFP) Manual Valve
Position Switch Assembly
Courtesy of GENERAL MOTORS CORP.

12. Inspect the transmission fluid pressure manual valve position switch assembly for the

following conditions:

Damage

Debris

Damaged or missing O-rings

Cracked connector

Loose electrical terminals

Poor terminal retention

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

Fig. 131: Identifying Manual Detent Spring
Courtesy of GENERAL MOTORS CORP.

13. Remove the manual detent spring bolt.

14. Remove the manual detent spring.

15. Inspect the manual detent spring for cracks or damage.

IMPORTANT: Keep the valve body level when lowering it from the vehicle.

This will prevent the loss of checkballs located in the valve
body passages.

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

16. Remove the remaining valve body bolts.

Fig. 132: View Of Valve Body To Transmission Case
Courtesy of GENERAL MOTORS CORP.

17. Carefully lower the valve body from the transmission case while simultaneously

disconnecting the manual valve link.

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado