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What type of Gear oil to use for a 1991 jeep wrangler sport?

The recommended gear oil for a 1991 Jeep Wrangler Sport's differentials and transfer case depends on the specific axles and transfer case it has. Jeep Wranglers of that year came with a variety of options. You must check your owner's manual (if you have it) for the exact specifications.

However, generally, for that era Jeep Wrangler, you'd likely need:

* Differentials: 75W-90 GL-5 gear oil is a common and often recommended choice. Some owners prefer synthetic 75W-90 GL-5 for better performance and longevity, especially in harsh conditions. *Always check your owner's manual to confirm the correct viscosity and GL rating.*

* Transfer Case: This is where it gets trickier without knowing your specific transfer case. It could be 75W-90 GL-5, but it *could* also require a different weight or specification. Again, your owner's manual is the definitive source. If you don't have the manual, you can usually find a digital copy online or consult a Jeep parts website or mechanic.

Crucially: Don't just assume. Using the incorrect gear oil can damage your components. Double and triple check your owner's manual or consult a Jeep specialist. The axle and transfer case codes (often stamped on the components themselves) can also help identify the correct fluid.

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