How to Check the Differential Fluid in a Dodge RAM 1500

by John Walker

Dodge designed the Ram 1500 with two-wheel and four-wheel drive options. The four-wheel drive options use a transfer case and front and rear differentials. The front and rear differentials operate in the same manner when engaging four-wheel drive. The fluids for the differential depend upon the type of differential installed. A standard differential uses SAE 80w140. Limited slip, Dana 60 or a Spicer differential uses SAE 80w90. Identify the proper type by locating the vehicle information sticker under the hood of the vehicle or consulting your owner's manual.


Locate the fill plug on the rear and front differentials. The plugs are round, slightly convex rubber pieces near the top quarter of the differentials.


Slide a flat-head screwdriver under the lip, and pop out the plug.


Insert the short end of an L-shaped Allen wrench into the hole, and slightly spin the Allen wrench. Remove the Allen wrench. The differential is full if there is a slight amount of fluid on the tip of the Allen wrench. Fill, as necessary, using the appropriate weight oil.

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