The Aspen and Volare- models came equipped with a standard 7 1 / 4 inch rear axle was also available, which used 10 bolts to retain its cover. Axle ratios are stamped on a tag retained by one of the cover bolts. Only the 8 1 / 4 inch axle could be equipped with the Sure-Grip® traction unit. To identify a Sure-Grip® equipped axle, used the following procedure:
- Safely lift and securely support both rear wheels off of the ground with jackstands.
- Place the transmission in Neutral (manual or automatic).
- Rotate (turn) one wheel by hand while observing the opposite wheel.
- If both of the wheels are rotating in the same direction, then it is equipped with a Sure-Grip® differential.
Both axle models use SAE 80W-90 GL-5 gear lubricant for temperatures to -30°F; below -30°F, 75W lube is recommended. Sure-Grip® models also require 4 oz. of MOPAR Hypoid Gear Oil Additive Friction Modifier, part no. 4057100 or equivalent, added to the gear lube.