* Automatic Transmission: If it has an automatic transmission (likely a 3-speed or 4-speed), you'll need to check the owner's manual or the dipstick itself for the recommended ATF (Automatic Transmission Fluid). Common possibilities include ATF+3 or ATF+4, but you MUST verify this with your owner's manual. Using the wrong fluid can severely damage the transmission.
* Manual Transmission: If it has a manual transmission, you'll need gear oil. Again, your owner's manual will specify the weight and type of gear oil recommended (e.g., GL-4, GL-5, a specific weight like 75W-90).
Never guess. The owner's manual is your definitive source. If you don't have the manual, you can often find a digital copy online by searching for your specific Jeep Wrangler's year, model, and trim level. A Jeep parts dealer or mechanic can also tell you the correct fluid based on your VIN.
