Multipurpose hypoid gear lubricant meeting API GL-5 requirements and having a viscosity rating of 80W-90 can be used in conventional differential axles. Trak-Lok® and Power-Lok® limited slip units must use a friction modifier. A Mopar® friction modifier additive is available to cure chatter and noise in these units. For more information on rear axle identification, please refer to the serial number identification information earlier in this section.
To check the axle lubricant level, remove the axle filler plug with the truck parked on a level surface. This may be a rubber plug or threaded plug depending on model.
The fill plug on some axles may be the rubber plug type. Be careful not to damage the plug when removing or installing it-9 1 / 4 inch rear
You can use a finger for a dipstick, being careful of sharp threads. If necessary, add lubricant. Gear oil can be purchased in plastic quart bottles with a handy spout. Just squeeze to add the lubricant. The lubricant level should be just below the bottom of the filler plug hole.
Lubricant level should be just below the bottom of the filler plug hole
DRAIN AND REFILL
Sealant should be applied as follows:
- Scrape away any remains of the paper gasket or old traces of sealant, as applicable.
- Clean the cover surface with mineral spirits. Any axle lubricant on the cover or axle housing will prevent the sealant from taking.
- Apply a 1 / 16 - 3 / 32 in. (1.6-2.4mm) bead of sealant to the clean and dry cover flange. Apply the bead continuously along the bolt circle of the cover, looping inside the bolt holes as shown.
- Allow the sealant to air dry.
- Clean the carrier gasket flange (if solvent is used, allow it to air dry). Install the cover. If, for any reason, the cover is not installed within 20 minutes of applying the sealant, remove the sealant and start over.