FLUID LEVEL CHECK
See Figures 1, 2, 3 and 4
The standard front and rear axle differentials use SAE 75W-90, API Grade GL-5 gear lubricant. In Trac-Lok® axles, use a limited slip friction modifier additive with the gear lubricant.
When towing a trailer, use SAE 80W-140, API Grade GL-5 gear lubricant in the rear axle.
Check the level of the oil in the differential housing every 5,000 miles (8,052 km) under normal driving conditions and every 3,000 miles (4,831 km) if the vehicle is used in severe driving conditions. When you remove the filler plug, the oil level should at least 1 / 2 inch below the filler hole. If it is not, replenish the supply until it is at the correct level. Install the fill plug and tighten to 25 ft. lbs. (34 Nm).
The lubricant should be changed every 30,000 miles (48,309 km). If running in deep water, change the lubricant daily.
DRAIN AND REFILL
See Figures 5, 6, 7, 8, 9 and 10
- Raise and safely support the vehicle.
- Remove the axle differential housing cover and allow the lubricant to drain out into a proper container.
- On 1987-90 models, thoroughly clean the old gasket material from the differential housing and cover and install the differential housing cover and a new gasket. Tighten the cover attaching bolts to 20 ft. lbs. (27 Nm).
- On 1991-95 models, thoroughly clean any old RTV sealant or gasket material from the differential housing and cover and apply a bead of RTV sealant around the bolt circle on the housing and on the cover. Install the differential housing cover and tighten the cover attaching bolts to 35 ft. lbs. (47 Nm).
- Remove the fill plug and add new lubricant to the fill hole level.
- Replace the fill plug.
Trac-Lok® (limited-slip) differentials may be cleaned only by disassembling the unit and wiping with clean, lint-free rags.