I have a '92 YJ with a 4.0L engine, 5-spd trans, 33" tires with a 4" lift. Took it to Moab last week and could have used some more power. Does anyone have some suggestions for improving performance short of putting in a V8?
I don't know much about this, but other people have often said that reducing weight, especially "rolling weight" (big/heavy tires and wheels etc.) can make the engine work surprisingly better. I can't say how true or not it is myself, but that makes sense.
If your pretty sure theres nothing wrong with your engine, then for sure gears, I have 35" s and my jeep was a dog before i put the 4.88's in, now in four low it idles up most hills, also you could get a 4 to 1 transfer case , but I would do the gears 1st.
Gears will definately help assuming that you still have stock gears...maybe 4.56.
Also, intake and exhaust are the simplest things to get you some more go. The more you do on the exhaust the more power you will gain. You can start with a cat back, then maybe a high flow catylatic converter, and then you can go all the way and throw on a header. With a high flow intake and the exhaust upgrades you will get a noticible increase in power...or you could throw in a V8
91badass, how are the 35's and 4.88 on the highway?
Well I have the 3 speed auto, and just ran about 180 miles to laughlin to run the mojave rd, and ran about 3100-3500 rpm at about 61 to 66 mph, there are a few steep climbs on the way and never lacked for power. Ive had those gears in there for a year but thats the fastest i ever drove because i just installed a high steer kit and that really cured my bump steer, before that I was having to hold the steering wheel like grimm death.