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Old 11-10-2011, 08:54 PM   #1
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32x11.50R15 Tires, what gearing?

Looking to put 32x11.50r15 BF Goodrich A/T KO Tires on my 4 banger 93 YJ, what type of gearing should I go with? I know about the 8.8 Ford swap and plan on getting a 4.10 geared and upgraded. I have looked in numerous threads and there are no clear cut calls for this. Any ideas?

My Plan when i get back stateside from deployment:
-Smittybilt XRC Front Bumper
-Smittybilt SRC Side and Rear Bumbers
-Smittybilt XRC8 Winch with synthetic rope
-Rubicon Express 4.5" Heavy Duty Lift Kit (need all new shackles, bushing, the whole thing so went with the kit that has it all)
-Rubicon Mono-tube shock kit
-AEM Brute Cold Air Intake
-Radiator Express 3-Row Upgrade Replacement Radiator
-Derale Cooling Products Electronic Fan


There are numerous other idea's that I have writen down but that would take a while to transfer onto this page. If you have any other idea's on where prices are cheap and or other products im open for idea's. I do some off roading and all but nothing serious, just want to be able to do some muddin and crawling is needed or get bored. Thanks for your time.

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Old 11-10-2011, 09:42 PM   #2
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You should look at the gear calculators. But since im such a nice guy ill do the research for you. I dont know much about the 2.5L but from what i found is that with stock tires and gears (4.10) you should be running 2800 RPM ish at 70 mph. If you keep your stock gears with the new tire size you will be at 2400 RPM ish at 70 mph. So you got two sets of gears to chose from if you want to regear 4.56 and 4.88. 4.56 gears at 70mph will give you 2600 rpm ish. 4.88 will be 2869 RPM at 70 mph. 4.88 gears seem to be your best bet, it puts your RPM back where they should be and be good for a DD. If you decide on 33's your RPM with 4.88 will be 2782ish, that should still be with your power band for the 2.5l. I used 70 mph cause thats what the freeway speed is here. 5th gear was used the ration .80 but i think both the AX-5 and AX-15 use a .75 5th gear. Well hope this helps you, and that you make it back to stateside safe. Oh btw the calulator i used can be found at Calculators

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Old 11-10-2011, 09:58 PM   #3
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Take the gear ratio you have now then divide it by your tire size in inches. Then multiply that by what size you want to go to. Example 4.11/31=# then# times 33= new gear ratio
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Old 11-11-2011, 02:13 AM   #4
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Thanks for the help, and thanks for the research you spent, i was looking everywhere but for a calculator, now I know. If anyone has any other add-on's to my post please let me know.
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Old 11-11-2011, 06:24 AM   #5
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I run the same size tire on mine with 4.10 gears. No problems really. I never run it over 50mph so i don't even use 5th gear.
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Old 11-12-2011, 07:26 PM   #6
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I just replaced the tires on my Jeep. I have a 4 banger with stoc gears in the rear 4:10. I put 31x10.50 on. I have not noticed a change and performance since switching from 225x75x15 ( 28" tire ) The stock gears will be good for you up to 33's. You might want to change them if yoy go bigger then that.
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Old 11-12-2011, 07:39 PM   #7
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FWIW I'm running 70mph at just shy of 3000rpm, with room to accelerate on stock tire size (with 4.10's).

You should be looking at 4.88's with those tires.
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Old 11-14-2011, 12:53 AM   #8
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I need to check for myself, but according to the PO, my YJ 2.5 is running 4.23 with 33x10.50x15. I'm only in 4th most of the time when I'm on the road below 50mph. I think low range on these 2.5L is 4:1, so my low range is adequate for most stuff. If I wanted to really CRAWL with it, I'd have to drop quite a bit lower. For the casual use you describe, 4.10 should be fine with 32" tires. The fatter tires you're planning on (11.50) would probably like lower gears in the mud, so the 4.88 previously mentioned might be a better choice. With that much lift (4.5"), you might want to move to 33" tires anyway.
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Old 11-14-2011, 01:15 AM   #9
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Quote:
Originally Posted by Piper54 View Post
I need to check for myself, but according to the PO, my YJ 2.5 is running 4.23 with 33x10.50x15. I'm only in 4th most of the time when I'm on the road below 50mph. I think low range on these 2.5L is 4:1, so my low range is adequate for most stuff. If I wanted to really CRAWL with it, I'd have to drop quite a bit lower. For the casual use you describe, 4.10 should be fine with 32" tires. The fatter tires you're planning on (11.50) would probably like lower gears in the mud, so the 4.88 previously mentioned might be a better choice. With that much lift (4.5"), you might want to move to 33" tires anyway.
There no such ratio 4.23, either 4.10, 4.56, or 4.88. Do you have an atlas II, or Tera low kit in your jeep? If not you got the stock NP231its 2.72:1 low not 4:1.
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Old 11-14-2011, 05:56 AM   #10
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been running for a month or so now on my 33" gumbo mudders with a 2.5L 5 speed on my 93 and no issues? its a little slower, but a jeep isn't fast to begin with, stock 4.11/4.10 gearing and i don't have any issues offroading....except when i get high centered on some deep ruts a truck on 44's dug out...lol

only issue i have now is my trans, but i think i have mine worked out(might have water in it, it doesn't want to go into any gear when its 30 outside, but 45-50 and warmer it shifts like new
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Old 11-14-2011, 06:20 AM   #11
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Quote:
Originally Posted by 95YamJam View Post
I run the same size tire on mine with 4.10 gears. No problems really. I never run it over 50mph so i don't even use 5th gear.
I'm running my rig with 33's and 3.73 with no problem at all. She does 70 in 5th gear with easy, no vibrations or anything.
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Old 11-14-2011, 10:27 PM   #12
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With the 4 banger it is hard to get some high speeds going down the road, I already knew this was going to be a problem in Cali so i take it nice and slow. There has been some good idea's so I think I'm going to end up doing the 4.88 gearing (with the axel swap later on with more time to play with the Jeep) and someone said the Goodyear Wrangler Duratrac's were a good on/off road tire out there, so i'll switch to the 32x12.50R15 with some nice wheels. Thanks for all the feedback.

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