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Old 05-24-2010, 11:06 PM   #1
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Performance Upgrades?

As you all have noticed a jeep wrangler with a 4 inch lift and 33's isnt exactly fast. So im looking for a little more power. I was wandering if anyone had good suggestions on upgrades. I was looking into the usual: cat back system, cold air intake, headers, performance tuner, throttle body spacer. What is the best bang for your buck or if anyone has other suggestions. All would be for a 4.0.

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Old 05-24-2010, 11:09 PM   #2
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The best bang for your buck would be to regear your axles, that is whats going to bring your speed back to stock, none of the other crap is worth the money

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Old 05-24-2010, 11:12 PM   #3
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My last Jeep was bored .060", had a different cam, valve work and headers with both a high flow cat and flowmaster exhaust. It was hugely different from my friends stock Jeep of the same year with the same tires, but it was very expensive. I made it for Moab though as I was there once a month at least during college. I really wonder about the header exhaust system and what I could get out of that. Someone said Banks improved their system 100%, but I do not believe that one.
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Old 05-24-2010, 11:17 PM   #4
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how much to regear your axles? Suggestions on place to go?
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Old 05-24-2010, 11:57 PM   #5
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Generally the ring and pinion cost ~$160 for each axle, and then whatever labor is. It'd be best to go to a mechanic who specializes in that kind of work, not just an every day guy
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Old 05-25-2010, 02:59 AM   #6
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Quote:
Originally Posted by firefighter777 View Post
As you all have noticed a jeep wrangler with a 4 inch lift and 33's isnt exactly fast. So im looking for a little more power. I was wandering if anyone had good suggestions on upgrades. What is the best bang for your buck or if anyone has other suggestions.
Get a lighter girlfriend/wife.
You'll increase your Horse Power, Speed, Reduce Coil Wear, AND have more money!
Best bang for your buck I can think of.

Sorry man, I couldn't resist.
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Old 05-25-2010, 06:11 AM   #7
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how much to regear your axles? Suggestions on place to go?

Parts and labor per axle can run 800-900 +/- a couple hundred.
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Old 05-30-2010, 02:44 PM   #8
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i am pretty new to the jeep thing and for regearing do you have to have both axles geared the same? I want to run 4.56 gears in the back axle do i have to do the same to the front
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Old 05-30-2010, 02:48 PM   #9
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i am pretty new to the jeep thing and for regearing do you have to have both axles geared the same? I want to run 4.56 gears in the back axle do i have to do the same to the front
YES!!! Both axles must be geared the same.

If not...when you use your 4wd...very expensive things WILL break.


Can you drive it in 2wd with it different ...yes but remove your front driveshaft until you get the front done...then you don't have to worry about forgetting about it and using 4wd and destroying your driveline.
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Old 01-25-2011, 06:19 PM   #10
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when replacing the gears, does anyone know if you have to up grade or replace the housing as well, I have a 2000 wrangler, 2.5ltr, 33s, 4 inch lift, cant find anywhere that it tells you what gears are in it factory, and cant get a straight answer on what gears to go with, where to buy them, or if the housing will eed to be replaced. Though about just buying a complete new differential, but looking for suggestions.
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Old 01-25-2011, 06:45 PM   #11
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everybody around here always wants more power out of there 4.0l.. Well let me tell you something, the 4.0 has a hell of alot of low end and high end torque and plenty of hp for a jeep, even with 33's and 35s.. If anyone one needs power its me and my 4banger with 31's... and barley hitting 70-75 on the freeway, with out wind and going down hill... lol

Coming soon this spring and engine swap, either 4.0 or v8
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Old 01-25-2011, 06:54 PM   #12
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Ive got the 4 banger as well, its a great work horse, but not made for speed that for sure, thats why I want to regear, just need more info on what to go with, but I feel you on the engine upgrade
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Old 01-25-2011, 08:55 PM   #13
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how much to regear your axles? Suggestions on place to go?
average is $1200-1600 and you go to the local drivetrain service shop. nothing else you can buy will help with larger tires, except the regear.
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Old 01-25-2011, 08:59 PM   #14
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I noticed a diff from the cowl intake/cowl snorkel i made...


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Old 01-25-2011, 09:18 PM   #15
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in what way do you see the difference since you added the home made snorkel, looks like you just shortened you breather and put it on top of the engine.
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Old 01-25-2011, 11:23 PM   #16
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I would regear both differentials. I got a quote as much at $1700 for both axles with open diff. I got all the parts for my front and still saving up for the labor cost.
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Old 01-26-2011, 12:06 AM   #17
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Ide personally reccomend a Cat-Back 1st, I see this as a good upgrade for any 4.0L. I see the 2.5 Exhaust shrinking to 2.25 after the cat-converter as a real bottlneck. Also catback adds some nice sound out the rear to match all the noise the engine makes
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Old 01-26-2011, 07:59 PM   #18
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in what way do you see the difference since you added the home made snorkel, looks like you just shortened you breather and put it on top of the engine.
if you look close in the second pic you can see the intake coming out of the cowl
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Old 01-26-2011, 08:18 PM   #19
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I have the 4.0 with 4 inch lift and 33s. Just went to this setup last week. Had 31s before. I do believe that regearing is the better thing to do but I chose to go with the different route. I was scared to start messing with gears mainly for the reason that my jeep is my daily driver. I got a cold air intake, throttle body spacer, mbrp exhaust and a superchip. I have noticed a good bit of difference with my throttle response and a relative increase in power, even with going up to 33s. I'm not saying it will burn the tires but I'm happy. With that said, I live in Louisiana, I'm not crawling rocks or any heavy offloading, just a little mudding here and there. I haven't ever driven a regeared jeep so I wouldn't know what to compare it to but maybe my experience will help out
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Old 01-26-2011, 08:23 PM   #20
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Thought I'd post a pic
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Old 01-26-2011, 08:36 PM   #21
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Come on over and I will let you drive mine. You will want to regear! I went to 4.88's and if It hadn't have been such a deal I would have gone with 4.27's. I was getting by with 3.07's and 33's - - but that was it: 5th gear required highway speeds and had to downshift anytime I hit a slight incline or a gust of wind. My hang up now is that at 60 MPH I am turning 2500 rpm....it HURTS to go 70. BUT: Under 50 mph I got acceleration galore. Even in 5th gear I can accelerate. Can start out in 2nd withou hitting the gas. 3rd gear at 5 or 10 mph ...no problem. Oh yeah... in 4 LO 1st gear is like entering time warp SLOOOWW.
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Old 01-26-2011, 08:40 PM   #22
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4.56 gears and 33 inch tires are perhaps the better set up.
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Old 01-26-2011, 08:48 PM   #23
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Sounds good, I might should mention I have an automatic too. I don't know what kind of a difference that would make. I wish I had the opportunity to drive a regear one before I did all my mods, but I just joined up here about month ago and didn't even know what regearing was.
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Old 01-26-2011, 09:25 PM   #24
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Sounds good, I might should mention I have an automatic too. I don't know what kind of a difference that would make. I wish I had the opportunity to drive a regear one before I did all my mods, but I just joined up here about month ago and didn't even know what regearing was.
what year auto?

97-02 32RH + 33s = 4.10s
03-06 42RLE + 33s = 4.88s or 5.13s.
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Old 01-26-2011, 09:34 PM   #25
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I don't know about you guys but i think my jeep is plenty fast, i have borla headers and catback with a performance ignition system on a 3 inch like with 33's and i zip around traffic and i go up to 85 if i dare to but i can easily go higher. 3.73 gears i think.
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Old 01-26-2011, 09:42 PM   #26
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01 tj, thanks, I guess it does make a difference
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Old 01-26-2011, 09:59 PM   #27
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NickEagle- nice Jeep.
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Old 01-26-2011, 11:04 PM   #28
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I use mine as a daily driver and then come home and use it on the hills of my property. I have a 99 4.0 5spd with 4.56 gears and 33" tires. It is the best setup and the power difference from the stock 3.73 gears is tremendous. Go with the gears...you won't regret it.
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Old 01-26-2011, 11:28 PM   #29
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I have a 2001 Sahara 6 cyl 3-sp. auto with 3:07 and 31" tires and the engine isn't even breathing hard at 65-70 MPH (can't remember the RPM offhand). Always wondered what it would be doing with the optional 3:73 that I should have ordered to begin with. At the time I thought the 3:73 would be too low for most highway driving.

Does anyone with the 3-sp auto have any experience with the 3:73?
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Old 01-27-2011, 07:27 PM   #30
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Ive got a 2000 auto, but a 4banger(2.5) it has the 3.73 gears factory, Im about to put the 4.56 gears in it, currently with the 3.73s its runs at around 2600 rpms at 65mph, but with 33's its pulling hard on the motor, if Im driving into a head wind, about 60mph is all itll do

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