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The Dodge Ram 1500 uses 75W-140 gear oil for its front differential. The front differential is where the power is sent in four-wheel drive, making it crucial to protect the gears there. Unlike engine oil, differential oil is thicker to handle the small, hot area and the rotating gears. Thinner oil would not provide the same level of gear protection. If you spot any leaks from your front differential, it's advisable to address them promptly to avoid expensive gear damage.
Dodge suggests using 75W-140 oil for the front differentials and either 80W-90 or 75W-140 oil for the rear differentials in your Dodge Ram 1500 pickup truck.
How can I add oil to the front differential?