GM Astro/Safari 1985-1996 Repair Guide



See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: View of a common rear axle identification number and location

Two types of rear axles are used: The standard and the locking. The axle is of a semi-floating type, where the vehicle weight is carried on the axle housing. It is designed for use with an open driveline and fiberglass leaf springs. All of the power transmitting parts are enclosed in a Salisbury type axle (a carrier casting with pressed tubes, welded into the carrier). A removable cover at the rear of the housing, allows the axle to be serviced without removing the entire assembly from the vehicle.

The locking rear axle, equipped with a speed sensitive, multi-disc clutch pack mechanism, locks both wheels together if either wheel spins excessively during slow vehicle operation.

The rear axle identification number is located on the front, right side of the axle tube. See the Rear Axle information in General Information & Maintenance for more information on determining the axle ratio, differential type, manufacturer and date built, from the letter codes.