Sierra 1500 4WD V8-5.3L VIN T (2004)
Install a new spring bumper assembly for 2WD 1500 Series Only with 20" wheels. Reuse the nut from the original bumper. Install the nut to the spring
bumper stud.
Tighten
Tighten the nut to 30 N.m (22 lb ft).
Remove the safety stands.
Lower the vehicle.
Knee Bolster Deflector
This modification is required for the following vehicles and ONLY applies to Extended Cab Long Box (K15953) Pickup models:
1999-2005 Chevrolet Silverado and GMC Sierra (1500 Series Only):
2005 Vehicles Built in Pontiac (VIN Code E) prior to VIN Breakpoint 5E100134
2005 Vehicles Built in Oshawa (VIN Code 1) prior to VIN Breakpoint 51113131
2005 Vehicles Built in Ft. Wayne (VIN Code Z) prior to VIN Breakpoint 5Z126605
The following procedure should be followed:
Apply the parking brake to prevent the vehicle from moving.
Remove the fuse panel cover.
Remove the I/P cluster trim plate bezel.
Remove the knee bolster.
Remove the 2 mm (0.078 in) thick knee bolster deflector.
Install the 1.5 mm (0.059 in) thick knee bolster deflector, P/N 12499966.
A detailed instruction sheet will be provided with the service part.
Re-Programming
