What kind of oil goes in rearend and transfer case 1999 dodge durango?

The exact type of oil for the rear differential and transfer case in a 1999 Dodge Durango depends on the specific options your vehicle had. Your owner's manual is the best resource for this information. It will specify the correct viscosity and type (e.g., GL-5 for the rear differential, likely a specific type for the transfer case).

However, generally speaking:

* Rear Differential: A 75W-90 GL-5 gear oil is a common choice for many 1999 Dodge Durangos. Some might require 75W-140, depending on climate and use (towing, heavy loads). Always check your owner's manual. Using the wrong type can severely damage your differential.

* Transfer Case: This is trickier. The transfer case oil type is less standardized. Your owner's manual will specify the correct fluid. It's often a specific ATF (Automatic Transmission Fluid) or a dedicated transfer case fluid. Using the wrong fluid here can also cause significant damage.

Before you do anything, consult your owner's manual. Looking up the information online for a 1999 Durango might provide some general suggestions but could be inaccurate for your specific vehicle configuration. The owner's manual will give you the definitive answer.