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The 2010 Dodge Ram 1500 requires SAE 75W-90 gear oil for its rear differential. The rear differential is the set of gears that the engine's power passes through before reaching the wheels. Since differentials are small and generate a significant amount of heat due to the moving gears, it is essential to use thicker gear oil for proper lubrication and protection. To ensure optimal protection, I suggest changing the differential fluid every 30,000 miles.
For the 2010 Dodge Ram Pickup 1500, it is advisable to use 75w90 fully synthetic differential fluid in the rear differential.