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Old 11-01-2011, 05:54 PM   #1
Join Date: Nov 2011
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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?

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Old 11-01-2011, 05:54 PM   #2
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07.5 Dodge 2500 Diesel 4x4 6 speed
95 YJ 4.0l/5-speed SOA, Wagoneer springs, 8k winch, 8.8 rear, 4.10 w/LSD, Front locked and 36's that rub on full flex
my build:
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Old 11-01-2011, 06:03 PM   #3
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Gearing perhaps? I don't want to be THAT guy though.
|2004 Jeep TJ "Green Machine"|4.0L 5 speed Dana44|33x12.50x15 Goodyear Duratracs|2.5" OME HD coils + 1.25" body lift|OME NitroSport shocks|4.56 gears|Skid Row Engine Skid|BCC Sliders|Currie AntiRock|
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Old 11-01-2011, 06:06 PM   #4
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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.
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Old 11-01-2011, 07:17 PM   #5
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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.
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Old 11-01-2011, 08:32 PM   #6
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Gears are your answer.

91badass, how are the 35's and 4.88 on the highway?
1992 Jeep YJ 4.0/AW4/ATLAS
60's on 40s
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Old 11-01-2011, 08:37 PM   #7
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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
87 YJ, 5.2/46RH/NP231, Custom 4 link/ Radius Arms, Ballistic Nitrogen Shocks, 35" Cooper STT
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Old 11-01-2011, 10:12 PM   #8
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Originally Posted by 183Beast View Post
Gears are your answer.

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.
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Old 11-01-2011, 10:40 PM   #9
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gears are step 1. a weight loss plane should be 2 most jeepers take way to much crap with them wheeling. 3 4:1 gears in the t-case for 4wd low. 4 stroke the 4.0

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