MODEL IDENTIFICATION
| Series (1) | Model |
|---|---|
| "C" | 2WD Pickup, Sierra, Silverado, Suburban, Tahoe & Yukon |
| "G" | Express, G-Van & Savana |
| "K" | 4WD Pickup, Sierra, Silverado, Suburban, Tahoe, Yukon & AWD Escalade |
| "L" | AWD Astro & Safari |
| "M" | 2WD Astro & Safari |
| "P" | Commercial Van (P42) & Motorhome (P32) |
| "S" | 2WD Blazer, Envoy, Jimmy, Pickup & Sonoma |
| "T" | 4WD Blazer, Bravada, Envoy, Jimmy, Pickup & Sonoma |
| (1) Vehicle series is fifth character of VIN. | |
| (1) | Vehicle series is fifth character of VIN. |
MODEL IDENTIFICATION - TRUCKS
DESCRIPTION & OPERATION
Steering gear is a variable ratio, recirculating ball-type which acts as a rolling thread between worm shaft and rack piston. The worm shaft is supported at lower end by a thrust bearing with 2 races. It is supported at upper end by a bearing assembly in the adjuster plug. Control valves, located inside steering gear housing, direct power steering fluid to either side of rack piston. (Scheme 1)
Steering linkage connects steering gear to front wheels through pitman arm. Steering linkage consists of pitman arm, idler arm, relay rod and tie rods. (Scheme 2)- (Scheme 12). Tie rod ends connect to relay rod by ball studs. Adjuster tubes between inner and outer tie rod ends are used to adjust toe. Some models have a shock absorber attached to relay rod.
Two different types of vane-type power steering pumps are used. The Model "P" pump is mounted inside reservoir. see scheme 18 The Model "CB" pump is mounted below reservoir. see scheme 20 On both models, vanes are driven by a rotor and move fluid from intake to pressure cavities of pump ring.
