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Old 02-21-2011, 05:29 PM   #1
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change axle or just regear?

i posted a few weeks back asking about regearing my 97 2.5L which has stock gears but im running 35's. i believe its D35 rear and D30 front on stock my year. i was going to be regearing to 4.88 in the future due to obvious reasons but should i change the axle or can i just regear it?? also is 4.88 enough or should i regear 5.13, then i would need to upgrade the axle to dana44?

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Old 02-21-2011, 05:30 PM   #2
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i would get a ford 8.8 rear and gear it and your front dana 30 to 4:88

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Old 02-21-2011, 05:31 PM   #3
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then i would change that terd under the hood
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Old 02-21-2011, 06:05 PM   #4
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i would get a ford 8.8 rear and gear it and your front dana 30 to 4:88
Close to my plans, I just put in my 8.8 with 4.88 and an Auburn ECTED this weekend and plan to swap in a HP D30. 4.88 should be sufficient for 35's but a 4 banger isn't even sufficient for stock tires (I learned to drive on a 97 TJ 4 banger with auto trans). I have a 97 TJ with a 4.7L Stroker. If you want 5.13 then you will have to swap in another axle, 4.88 is the lowest you can get in a D30 last time I checked.
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Old 02-21-2011, 06:13 PM   #5
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hah yea thats in the future plans also, was thinkin the chevy 350 or just the 4.0 but thats a big job for the future at least when i do ill have the gears. so u think i can leave the d30 and d35 axles?
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Old 02-21-2011, 06:14 PM   #6
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i mean leave the front 30
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Old 02-21-2011, 08:00 PM   #7
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yeah i run a dana 30 hp in the front with 4:88 gears on 37's
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Old 02-21-2011, 08:17 PM   #8
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Your rear Dana 35c axle is not up to a 35" tire, and 4.88 will not be a low enough ratio to run 35" tires with your 2.5L engine yet that ratio is the lowest either of your axles can be regeared to. 4.88 is a low enough ratio for 35" tires only with the 4.0L engine.

I would not run 35" tires with the 2.5L engine so long as I had either the Dana 30 up front or the Dana 35c in the rear.
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Old 02-21-2011, 09:19 PM   #9
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Jerry, what would you suggest for replacement axles? and how low gears should i be at so long as i still have the 2.5?
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Old 02-21-2011, 10:11 PM   #10
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I'd have to think that 5.13 gearing for that big of a tire and the 2.5L engine would probably be a good choice. For the rear, you could go with a Dana 44, Ford 8.8, etc. For the front, perhaps a Rubicon Dana 44 or some other form of Dana 44... to provide the ability to gear lower than 4.88 like 5.13.
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Old 02-22-2011, 12:41 PM   #11
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Yeah thats what i was thinking, thanks Jerry appreciate it, how do you feel about an engine swap for me?
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Old 02-22-2011, 01:06 PM   #12
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I own a 4.0L TJ, and a 2.5L YJ. I wouldn't think twice about turning 35 inch tires on the 4.0 with proper gearing. The YJ on the other hand, I wouldn't go past a 33 inch tire. The 2.5L is a great little engine, but has to work twice as hard as the 4.0L to do the same job. This is a lot of stress, and that's why you sometimes hear of 2.5L throwing a rod out the side of the block. Also, the transmissions on a lot of the 2.5L wranglers don't have the beef to withstand a lot of stress. Is your 97 a manual or an auto?

In my opinion, I would knock it down to 33 inch tires and go with 4.88 gears. Like I said, just my opinion.
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Old 02-24-2011, 07:18 AM   #13
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Yea true, its manual. It has the stock 4:10s in it now im thinkin of leavin the axles(for now) puttin in 4:88s and just light wheelin until i can do a swap to 4.0. How much of a difference do u think a high flow air intake and exhaust will make?
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Old 02-24-2011, 08:22 AM   #14
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How much of a difference do u think a high flow air intake and exhaust will make?
Zero. The factory air intake is already free flowing and can easily flow far more air than the engine can consume even at redline rpms and wide open throttle.

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