For the limited slip differentials, use genuine Dodge hypoid gear oil (part number 8149630EX) or equivalent. For the conventional axle, the API classification is GL-5 or higher and viscosity recommendations are as follows:
See Figure 1
Inspection and replacement should be performed any time a problem is observed or suspected. Severe usage conditions may require shorter intervals-refer to the owner's manual for your truck.
The fluid level must be checked every 30,000 miles (48,000 km) on conventional differentials. On limited slip units, change the fluid every 30,000 miles (48,000 km). To check the fluid level, first make sure the wheels are chocked and then simply remove the plug from the side of the unit. Place a drain pan under the drain and fill plugs to catch any spillage. It may be necessary to raise and support the vehicle on jackstands to access the drain and fill plugs on the differential unit. If the fluid runs out or you can feel with your finger that it's not more than 1 / 4 inch (6mm) below the level of the hole, the level levels is satisfactory. Otherwise, add the specified fluid with a syringe-like device you can buy at a local auto parts store.
DRAIN & REFILL
See Figures 2 through 8
- Make sure the wheels are chocked. Install a drain pan under the drain plug, located in the bottom of the differential housing. Place a drain pan under the differential unit to catch the fluid from the drain plug.
- If there is dirt or build up around the plugs, use a wire brush to remove the dirt. This will help keep contaminants out of the differential fluid.
- Remove the fill plug from the side of the unit, making sure to retain or replace the fill plug washer.
- Remove the drain plug, keeping it in your fingers.
- When the fluid has drained completely, replace the drain plug, making sure the gasket is retained on the plug.
- Add fluid until it runs out of the filler plug hole, and install the filler plug.