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Old 11-12-2013, 04:23 PM   #1
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Newbie yj question

Have a 1993 yj with a 2.5. Where do I find the identifier tags for the front and rear diffs? I want/need to regear but I don't even know what diffs I have.
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Old 11-12-2013, 04:38 PM   #2
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I know you want the tags but if it is stock, manual should have 4.10, automatic should have 3.73. That's just what they came with for the 4cyl.

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Old 11-12-2013, 04:39 PM   #3
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Model# and ratio are stamped/tagged on the diff cover. But, if it's stock-

Dana 30 in Front
Dana 35 in Rear
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Old 11-12-2013, 04:44 PM   #4
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Thanks. It's a standard but I was told by the person I bought it from that they regeared it to 4.10. I'm running 33 and want to go to 4.88
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Old 11-12-2013, 07:44 PM   #5
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If its been re geared, the only fail proof way to identify the ratio is to pull the covers & look at the ring gear. It'll have the ratio stamped on it.

If it has 4:10's in it now you wont need new carriers in order to go to 4:88's.

Dana 30: 3.07, 3.31, 3.54 Carrier break 3.73, 4.10, 4.56, 4.88

Dana 35: 3.07, 3.31, Carrier break 3.55, 3.73, 4.10, 4.56, 4.88
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Old 11-12-2013, 07:51 PM   #6
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Thank you. That's useful information. Where is a good place to get reasonable prices
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Old 11-12-2013, 07:55 PM   #7
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Www.eastcoastgearsupply.com tends to have good prices.


Web Shop Manager.org has good specials sometimes.
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'88 YJ 4.6L stroker, HEI, MC2150, AX15 swap
4" rub/ex, 33" BFG A/T's, SYE, rear locker
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Old 11-12-2013, 07:58 PM   #8
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Thanks
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Old 11-12-2013, 07:59 PM   #9
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I have always used Randy's Ring & Pinion. Pricey, but customer service is unparalleled. Shop around, you can find good deals if you dig for them.

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Old 11-12-2013, 08:37 PM   #10
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eBay?
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Old 11-12-2013, 08:49 PM   #11
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It would depend on the brand. If it's some off brand nobody has ever herd of I would be leery of getting them. This is one area you don't want to skimp on. Do it right the first time & be done with it.
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Old 11-12-2013, 08:53 PM   #12
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Ok. I'll do some research
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Old 11-14-2013, 05:18 AM   #13
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So does that mean 4.88 is the lowest I can go in a d35?
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Old 11-14-2013, 05:41 AM   #14
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4.88 is the lowest you can go..however you might want to look into a rear axle swap.. as most would agree the dana 35 is a weak rear axle... lots of folks swap in a ford 8.8 dana 44 or ford 9". With the cost of gears and install being so high.. putting money into the dana 35(unless its already been upgraded with better shafts and locker) is just not the best use of funds.
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Old 11-14-2013, 07:12 AM   #15
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I was told yesterday that 4.10 was as low as you could go in a ford 8.8
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Old 11-14-2013, 07:40 AM   #16
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I know you can go to at least a 5.71
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Old 11-14-2013, 07:45 AM   #17
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If I find one out of as explore, what all has to be modified
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Old 11-14-2013, 10:13 AM   #18
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Perches basically. 8.8 is such a common swap do some searching. You will find everything you need. Whoever told you 4.10 is the lowest you can get for a 8.8 probably meant that it is the lowest you will find as a stock ratio.
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'88 YJ 4.6L stroker, HEI, MC2150, AX15 swap
4" rub/ex, 33" BFG A/T's, SYE, rear locker
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Old 11-14-2013, 10:34 AM   #19
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I would like to go lower than 4.88. I just need to know if I can do that staying with the Dana or not
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Old 11-14-2013, 10:52 AM   #20
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I would think hard about going lower than 4.88 with your 2.5 unless you're building a strictly trail rig or you'll be screaming down the highway. Are you planning on locking either end? I would not lock the D35, period. The D30 could handle it but unless you can set your own gears It's going to cost you. I'd look at the 8.8 with LSD in 4.88 and the D30 with TJ axles and Aussie locker in 4.88 for a somewaht budget build. If you have some money I'd go 8.8 and D30 with ARB in both, or ARB in back and Aussie up front.
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Old 11-14-2013, 11:07 AM   #21
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This is going to be my daily driver. With the occasional light trail riding. I don't plan on locking at all. Some ppl say 4.88 won't be low enough and other say it will be perfect.
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Old 11-14-2013, 11:53 AM   #22
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Looking back at your posts I see you are running 33's. You don't say whether you are planning to go bigger. I wouldn't go deeper than 4.88's unless you go to something bigger than a 35. 4.88's will be a bit on the deep side with 33's and probably about right with 35's. Especially if you are building it as mainly a street driver.

I am planning on running 4.88's when I build axles. 37's are the max I would run with the diffs I am gonna build (planning on 35's before though), so it will be perfect with my 4.6 stroker.
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Old 11-14-2013, 12:11 PM   #23
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No I do not plan on going any bigger with the tires. So in your opinion 4.88 will get the job done. I can't remember if I have mentioned this or not but one problem I'm having is 5th gear (over drive) is completely useless... I literally lose speed when I go to 5th
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Old 11-14-2013, 01:55 PM   #24
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That's because you have stock gears and 33's. Everyone else has the same problem (me included) until they regear.
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'88 YJ 4.6L stroker, HEI, MC2150, AX15 swap
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Old 11-14-2013, 01:59 PM   #25
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Did you go with 4.88
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Old 11-14-2013, 03:14 PM   #26
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I have not regeared yet. My jeep is torn apart in the garage right now and I am waiting on the head and cam to be done so I can put my 4.6 stroker in. For now I am on stock gears. When I build axles I am planning on 4.88's.
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Old 11-14-2013, 05:23 PM   #27
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4:88's will work fine for you with 33's. Ive always said it's better to be a little over geared with the 4 banger vs. under geared. WR is correct. A gear swap to 4:88's will restore your 5th gear. The 4 banger just doesn't have the power with 4:10's & 33" tires.

As for the D35, I'm in the process of re gearing to 4:88's myself. If you're easy on the D35 you shouldn't have any problems. I got a good deal on a set of 4:88's for my dana axles, so I jumped on it. Just remember, the D35 wont take abuse with 33's & 4:88's. It was in no way shape or form designed to be turning 33" tires with a 4:88 ratio.

Keep tire spin to a minimum if you do any offroading & use minimal throttle. Always keep it in the back of your head the D35 is the weakest link. I busted a D35 doing a hard 2nd gear power shift on dry pavement with my first 4 banger Jeep. Barked 2nd gear like a champ & everything was cool till the axle slid out of the tube!
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Old 11-14-2013, 11:40 PM   #28
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You can break a d35 by "power shifting" a 2.5L... so sad. Haha. Was the jeep stock?
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'88 YJ 4.6L stroker, HEI, MC2150, AX15 swap
4" rub/ex, 33" BFG A/T's, SYE, rear locker
Stroker Thread
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Old 11-15-2013, 02:33 AM   #29
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lol. It had a 3" BL w/ 31's. Made a lot of great Jeep memories with that rig. I power shifted that poor thing everywhere I went. It would bark 2nd like a pro, sometimes I could get a chirp in 3rd! Poor d35 & ax5. I put it thru hell.

That was high school, 15 years ago. I can't afford to drive like that these days. Too hard on equipment.

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