To find the correct fluid, you should:
1. Check your owner's manual: This is the most reliable source. It will specify the recommended fluid type and capacity for your specific vehicle's axles.
2. Look at the axle tags: The axle housings usually have tags indicating the axle type (e.g., Dana 30, Dana 44) and sometimes a recommended fluid type. These tags are typically found on the driver's side of the axle housing.
3. Check with a Jeep dealer or parts store: Provide them with your Jeep's VIN number. They can look up your vehicle's specifications and tell you the correct fluid.
Generally, Jeep Wranglers of that era often used:
* 75W-90: This is a common gear oil for differentials. However, there are variations (synthetic, conventional, etc.) and some may require a specific type of 75W-90 (like limited-slip differential fluid).
Do not assume. Using the wrong type of fluid can damage your differentials. Always verify the correct fluid type before changing it.
