AXLE RATIO & IDENTIFICATION
To determine drive axle ratio, see DRIVE AXLE RATIO IDENTIFICATION article in the DRIVE AXLES Section.
MODEL IDENTIFICATION
Vehicle model can be identified by fifth character of Vehicle Identification Number (VIN), stamped on metal pad on top of left end of instrument panel, near windshield. See MODEL IDENTIFICATION table.
| Series (1) | Model |
|---|---|
| "C" | 2WD Pickup, Sierra & Suburban |
| "G" | RWD Van |
| "K" | 4WD Blazer, Pickup, Sierra, Suburban & Yukon |
| "L" | All-Wheel Drive Astro & Safari |
| "M" | 2WD Astro & Safari |
| "P" | Commercial Van/Motorhome |
| "S" | 2WD Blazer, Jimmy, Pickup & Sonoma |
| "T" | Bravada, 4WD Blazer, Jimmy, Pickup, Sonoma, Syclone & Typhoon |
| "U" | Lumina APV, Silhouette & Trans Sport |
| (1) Vehicle series is fifth character of VIN. | |
| (1) | Vehicle series is fifth character of VIN. |
MODEL IDENTIFICATION
Locking differential consist of either a 1-piece case or 2-piece case. The 1-piece case is used on all axles except models with 10 1/2" ring gear axle. The 10 1/2" ring gear axle uses the 2-piece case. The 1-piece case has 2 pinion gears. The 2-piece case has 3-pinion gears. Both types have a clutch disc pack behind each of the side gears.