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What weight of gear oil to use in rear end a 1999 dodge ram 1500?

The weight of gear oil for your 1999 Dodge Ram 1500 rear end depends on the rear axle ratio and the climate you live in. You must check your owner's manual or the sticker on the differential cover for the recommended weight. The sticker will usually be located on the differential itself.

The manual will specify the recommended weight, which is typically either 75W-90, 75W-140, or possibly another specification. Using the incorrect weight can damage your rear differential.

Do not rely on general advice found online; always consult your vehicle's documentation. Providing the rear axle ratio (e.g., 3.55, 3.92, 4.10) might help others give a more informed guess, but it's still no substitute for checking your vehicle's specifications.