What fluid goes in 1999 ram 1500 4x4 5.9L rear axle?

The 1999 Ram 1500 4x4 with a 5.9L engine typically uses 75W-140 gear oil in the rear axle. However, it's crucial to check your owner's manual. The specific recommendation might vary depending on the exact rear axle type (e.g., Dana 50, Dana 60, etc.) and your climate. The manual will list the correct type and amount of lubricant.