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Old 04-03-2011, 09:18 AM   #1
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yj 4 cyl

I have a 1990 yj with 33s and im looking to regear the front and rear diff but not sure what to upgrade it to a 456 or 488. 5th gear is as useless as a screen door on a sub and didnt change much from the 30in tires to the 33s. Suggestions anyone?

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Old 04-03-2011, 09:56 AM   #2
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I would say pass 4.56 and move right to 4.88's with your setup. I would also say that before you dump money into the dana 35, look at a ford 8.8 swap or dana 44 rear.

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Old 04-03-2011, 11:13 AM   #3
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Now increasing that ratio will give me more rpms right? The diffs will be spinning faster?
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Old 04-03-2011, 03:16 PM   #4
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Yes the rpm's will be up.
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Old 04-03-2011, 11:03 PM   #5
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What gears do you have now? I'm not sure about YJ's but my TJ and most 4 banger TJs have 4.10's.
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Old 04-04-2011, 02:41 PM   #6
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Stock gears which i think are 410 as well
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Old 04-06-2011, 12:32 AM   #7
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I've got an 04 TJ with the 2.4L 4cyl, manual trans,4:88's and I'm running the 4.5" RE lift with 33X10.50x15 BFG KM2's and I think its perfect, all gears are fully useable. Only thing else I would like to have is what everyone else wants and thats a lower crawl gear.
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Old 04-06-2011, 06:21 AM   #8
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OP 4:88s are at the limit of the dana 30 any lower and you run the risk of snapping ring gears/pinions

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Originally Posted by phritchey View Post
I've got an 04 TJ with the 2.4L 4cyl, manual trans,4:88's and I'm running the 4.5" RE lift with 33X10.50x15 BFG KM2's and I think its perfect, all gears are fully useable. Only thing else I would like to have is what everyone else wants and thats a lower crawl gear.
Look into the teralow 4:1 low range kit for the 231 they will help you get a lower crawl ratio.
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Old 04-08-2011, 02:31 PM   #9
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i have a 6 but i ditched the stock axles and went with a toyota 8 inch and a waggy 44 with 4.88s for relativly cheap and i run 35s but i could run 38s just have new 35s so dont see the point not to mention i go damn near anywhere cause im locked front and rear but i would say 4.88s would be a good ratio for 4 cyl
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Old 04-10-2011, 10:58 PM   #10
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You can play with this calculator if you want to see what gearing and tire size does to your rpm.

RPM / Speed / Gear Ratio Visual Calc

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