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Old 06-25-2010, 10:04 AM   #1
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regearing... 4.56 vs 4.88

hey all, this is my first post so here it goes...

bought my first jeep about a month ago, and im hooked. ive read up on regearing but still am unsure about which would be my best option.

I'm running a 4" lift on 33x12.50 tires on my 02, with the stock 2.5L and 5sp tranny. I love my rig, but with a top speed of 65 (downhill and wind at my back) my first priority is new gears. I considered intake/exhaust and chips but after reading some threads it seems obvious gears are the only way to go. So the question i pose is this...4.56's or 4.88's? What are the pro's and con's of both? I dont ever plan on running bigger than 35's (if that) and its my DD. I believe I have stock 4.11's. Will the stock axle be enough to handle new gears?

thanks for any input!

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Old 06-25-2010, 10:10 AM   #2
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While 4.56 is a ratio that is often recommended for 33" tires, that is only for when the engine is the larger 4.0L. With your 2.5L engine that needs slightly higher rpms to turn a tire that large, the correct choice is 4.88. You would be disappointed with the performance from 4.56, for sure. And a big welcome to WF.

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Old 06-25-2010, 10:21 AM   #3
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Thank you sir! the guy at 4wd told me 4.56 would be ideal, but i spoke with another jeeper running 4.88's on 35's with the 2.5L and he said that was best. i figured wf would help me to make the best decision. this means i will get 5th gear back? lol

oh, and 4wd quoted me at $1200 out the door with an overnight stay for the rig. Does this sound about right?
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Old 06-25-2010, 10:23 AM   #4
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oh, and 4wd quoted me at $1200 out the door with an overnight stay for the rig. Does this sound about right?
Sounds better than the quote's I've been getting in my area. It's closer to $1500 around here....
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Old 06-25-2010, 10:27 AM   #5
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$1200 isn't bad at all but they probably quoted that using the cheapest possible gears like Genuine Gear which is their house brand. I paid $1087 for my last regearing job which included Spicer gears which is about the best you can get. I'd ask them to sharpen their pencil a bit more, their first price is usually what they hope you'll agree to.

Don't listen to that guy at 4WD who said 4.56 would be ideal for 33" tires and your 2.5L engine, he doesn't know what he's talking about.
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Old 06-25-2010, 11:35 AM   #6
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and the stock axles will hold up well?
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Old 06-25-2010, 12:29 PM   #7
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and the stock axles will hold up well?
Generally speaking, the stock axles are usually ok with 33" tires so long as you don't also install a locker. It's the rear Dana 35c axle that is the real weak point but it is usually ok so long as you leave the lockers out of it and limit your tire size to 33". But even with that said, take it easy on the axle and don't get it hopping or overstress it as I have seen it break with even 31" tires when abused.

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