I have a 4cyl yj with one ton axles and the only problem I have is wen I'm going up steep rocks or hills the jeep won't go up if it's too steep or it will turn off. Wat gears can I put in so it can help me?? I was thinking 5.13.
What gears do you have now? How much highway use does it see? There are lots of gear calculators out there that will tell you where your RPMs will be at speed. I am thinking 5.13's sound good, but if you have limited highway use you may even want to go lower. I am sure someone else will chime in with more experience here specific to your 4 banger. A V8 might solve your problem too.