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The 2012 Dodge Ram 1500 uses MOPAR Synthetic Gear Lubricant SAE 75W-140 (MS8985) for its rear differential fluid. If your axle has limited slip, it is advised to include 5 ounces of MOPAR Limited Slip Additive. The purpose of the differential fluid is to lubricate the various components of your axle, such as the ring, pinion gears, bearings, and other vital parts. Maintaining the proper level of oil is crucial to prevent metal to metal contact and avoid overheating of your differential. I recommend following the instructions in your owner's manual to change the differential fluid regularly to prevent overheating issues and costly repairs.
The quantity of rear differential fluid that the dodge Ram 1500 can hold is 8.5 pints.