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Old 07-10-2012, 07:56 PM   #1
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4 cyl, 5 speed, 4.88 and 33's or 32's

My plan is to regear to 4.88 for 33x12.5x15 or for 32x11.5x15's. Would it be better to go the smaller tire to have enough power in the sand and highway? Right now I have 30x9.5x15 with stock 4.11 gears and run 3000 RPM at 73(via gps). I have to down shift on the highway when in hilly terrain in Michigan. What RPM would 4.88's and 33's or 32's run at 70? Can any body out there with these gear/tire size combos give an idea on what to expect. Thanks in advace for any feedback. -Steve

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Old 07-10-2012, 09:59 PM   #2
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I like the 4.88 and 33" tire combo. Have seen it run many times and it is about perfect.

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Old 07-11-2012, 12:41 AM   #3
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30 x 4.11 x .85 od = 3000 rpm @73 mph
33 x 4.88 x .85 od = 3200 rpm @73 mph
Should work just like the ones you have now. But better.
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Old 07-11-2012, 09:22 AM   #4
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I regeared my old 4 cylinder TJ to 4:88 and ran 33s just fine. With yours being a 5 speed I will say if you hit a steep bridge you'll probably have to downshift on occassion, I know I did. I also pulled the throttle body off of a 4.0 TJ and replaced the one on my 2.5, it gave the Jeep a little better throttle response.
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Old 07-11-2012, 12:11 PM   #5
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Quote:
Originally Posted by letsgohunting View Post
My plan is to regear to 4.88 for 33x12.5x15 or for 32x11.5x15's. Would it be better to go the smaller tire to have enough power in the sand and highway? Right now I have 30x9.5x15 with stock 4.11 gears and run 3000 RPM at 73(via gps). I have to down shift on the highway when in hilly terrain in Michigan. What RPM would 4.88's and 33's or 32's run at 70? Can any body out there with these gear/tire size combos give an idea on what to expect. Thanks in advace for any feedback. -Steve

Great link.

Gear Ratio Calculator

I'm running 4.88's with 30's right now.
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Old 07-11-2012, 07:52 PM   #6
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Thanks for the information and link, very much appreciated -Steve
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Old 07-12-2012, 09:43 AM   #7
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If you stick with the 33's, regearing from 4:11 to 4:88 should increase your rpm's to approximately 3562 at 73 mph, if you're runninng 3000 rpm at that speed now.

Never mind, I thought you were running 33's now.
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Old 07-13-2012, 02:11 AM   #8
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If you run 33's from a stock axle, will you need to get regeared higher?
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Old 09-03-2012, 04:15 PM   #9
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Update: I have 4.88 gears and run 31x10.5x15 Duratracs and love it. No down shifting on the Highway in upper lower Michigan. Gas mileage also went up. I have enough gear to go up a tire size later.
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Old 09-03-2012, 04:30 PM   #10
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Update: I have 4.88 gears and run 31x10.5x15 Duratracs and love it. No down shifting on the Highway in upper lower Michigan. Gas mileage also went up. I have enough gear to go up a tire size later.
Good to know, looking to do this on my '97, how much was it to regear to 4.88?
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Old 09-03-2012, 06:36 PM   #11
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about $160.00 for the gear sets from summit, and another $150.00 and axle from the shop.
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Old 09-03-2012, 06:46 PM   #12
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Is it hard to do yourself? Im still a rookie grease monkey, I like to get under it and work on it myself but finding someone to show me some of the more complex stuff is kinda hard.
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Old 09-03-2012, 06:51 PM   #13
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Is it hard to do yourself? Im still a rookie grease monkey, I like to get under it and work on it myself but finding someone to show me some of the more complex stuff is kinda hard.
very.
the reason it cost so much is because it takes time, and you have to be extremely precise, etc. there are special tools you need as well.
it is something to really leave to the pros.

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