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Old 06-22-2014, 09:51 AM
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Re-gearing advice

For starters, I have a 2001 wrangler with a 3 inch suspension lift, 2.5L 4cl, 5-speed, with 33 inch tires. As far as I know the gears and axles are stock. For work I usually drive around 20 miles on the highway and in WV the highway has very large hills and the speed limit is 70 mph. Yesterday, I could only muster 50-55 mph up hill in 4th, and whether I was in 4th or 5th down hill the jeep seemed to really fight me to get above 63 mph even at 2300 rpms in 5th. I know that its a jeep and its not meant for speed, but I would like to just keep up with traffic around 65 with out loosing all my power.

I know that 4.56 is the ideal gear ratio for a 5-speed with 33's for a 4.0, but is it safe to assume that is the case for my 2.5? Also what a some gear brands and/or kits you recommend? I've never re-geared a differential, but I have no doubt that I have the ability to. How long has this taken you guys to do yourself? And I have read in another post that you can re-gear only your rear differential as long as you don't put it into 4wd? I ask so that I can kind of split the cost and time to get one done for now and then do the front once I set aside more jeep money.

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Old 06-22-2014, 11:32 AM   #2
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4.56 might help, but I doubt it will solve your main issue, the lack of power. The bigger tires are just more weight for the 4cyl to push. Regearing is doable, but everyone that has done it has told me the same thing, never again, next time they would pay.

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Old 06-22-2014, 04:06 PM   #3
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4.56 might help, but I doubt it will solve your main issue, the lack of power. The bigger tires are just more weight for the 4cyl to push. Regearing is doable, but everyone that has done it has told me the same thing, never again, next time they would pay.
Why wouldn't it solve his problem? Sure more power would be nice but 33's are big for his 4.11 gearing. With the 2.5 I would go 4.88. Yes you can regear axles at different times as long as you don't use 4wd.

Get timken bearings (G2 master install kits come with them) and some good name brand gears. I went with G2
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Old 06-22-2014, 04:09 PM   #4
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For 33" tires, 5-speed transmission, and 2.5L four-banger engine, you need 4.88 gearing. 4.56 is only appropriate with the much more powerful 4.0L six-cylinder engine.

4.88 gearing would make a night and day improvement in performance with even his 2.5L engine. That's an extremely popular upgrade for those with that engine and 33" tires because it works so well to restore the performance loss caused by the bigger tires.
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Old 06-22-2014, 04:26 PM
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Will stock axle shafts hold up well with the 4.88s? I know the 2.5 isn't putting a ton of power out, but want to make sure I get a full estimate of what it will take to happen.



Edit: Also, just out of curiosity, what is the difference between regular ring and pinion gears and reverse ring and pinion gears?
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Old 06-22-2014, 04:41 PM   #6
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Yes your stock axle shafts will be fine with 33's and 4.88 gearing so long as you don't install lockers.

Reverse ring & pinon gears just refers to which side of the gear surface is being driven by the pinion gear. In the front with the standard low-pinion TJ axle, it's the reverse side and in the rear with the standard low-pinion axle, the gears are driven on the "normal" side of the gear. So in the front you need reverse cut gears and in the rear you need standard non-reverse gears.
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Old 06-22-2014, 05:05 PM
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Thanks guys for all your help. I'm gonna go with 4.88 then with a master install kit. Still open to suggestions on brands/kits.
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Old 06-22-2014, 05:24 PM   #8
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Thanks guys for all your help. I'm gonna go with 4.88 then with a master install kit. Still open to suggestions on brands/kits.
Since it doesn't appear like you will be personally installing the gears, I would definitely NOT buy the gears & master install kits to give to a shop to install in the hopes of saving a little $$$. You want the installing shop to provide all of the parts so if anything goes wrong, and things do go wrong during or after some R&P installations, their warranty will cover everything including the parts they provided and their labor.

If you gave them the parts, they could just blame the parts and make you pay for more labor to remove/reinstall the replacement parts. Not to mention that since most R&P installation problems are caused by a bad installation, it would be hard to get the now-defective parts replaced under warranty from where you bought them from.
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Old 06-22-2014, 05:33 PM
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I think I may be second guessing my ability to install the ring and pinion. I've found that a lot of tools (that i dont have) are necessary to do so properly and that it is something that should be done be some one who is very experience. What have any of your experiences been? expertise? and time frame?
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Old 06-22-2014, 05:53 PM   #10
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If you haven't done it before with someone to show you how, it's not something for a casual wrencher. I do all of my TJ's work, have been wrenching for 40+ years, have a shop full of tools, welders, etc. but I won't attempt to regear my axles. Most shops only trust this particular job to 1-2 of their best techs who have lots of experience. It's just too easy to screw up and once done improperly, the near gears will be toast in short order.
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Old 06-22-2014, 09:38 PM
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I'd hate to make a bad situation worse and be out several hundred. So professional install will be the way to go. Thanks Jerry for your words of wisdom, as well as jeepway and juan.
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Old 07-02-2014, 08:45 AM
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Does anyone have COMPLETE OFF ROAD brand gears? I don't want to be cheap, but they would save me $50 a set if I get those instead of Yukon.

COMPLETE OFF ROAD
High performance Ring & Pinion gear set for Model 35 in a 4.88 ratio

YUKON
High performance Yukon Ring & Pinion gear set for Model 35 in a 4.88 ratio
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Old 07-02-2014, 09:39 AM   #13
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I'd be inclined to try Revolution Gear. Send a pm to supporting vendor Garza from 4 low parts. Front and rear sets @ $155.59 each.
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Old 07-02-2014, 11:19 AM
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Have you used those gears? Id imagine that as long as they're machined well and an adequate metal is used the gears will be the same as any other.. I like the price though! I'll have to look into it. Just not happy that they don't sell a complete re-gearing kit or the dana 35 master install kit.

Also, whats the difference between the Dana 30 short and Dana 30 high?
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Old 07-02-2014, 01:39 PM
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Disregard the question about short/low vs high, Jerry answered that previously.
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Old 07-02-2014, 03:44 PM   #16
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I purchased 4.10 gears, master brg kits w/seals shim kits, new carriers, new rear axle/spider gears, from Ron's machining. $ 650.00 special-shipped. I installed (used to do for a living). been running for 2k now-all is well. Starting with new gears and carriers meant in/out 3-4 times to get pattern and lash right, but turned out good. No noise. runs a whole lot better than the 3.07s it had. 4.0L w/auto trans and 31"tires w/4" lift.

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