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Unread 08-08-2010, 08:21 PM   #1
Destr0
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4.56 or 4.88 gears for 94 2.5?

OK so I am getting an 8.8, and found one with 4.56 gears. If I get that one I will save about $250 over getting a different one and regearing to 4.88 on front and rear. How much difference is there? I will be running 35s so I know 4.88s would be better, but would it be worth the extra $$? If I go 4.88s I will not have the money to do the fronts right away. That isn't really a problem because I don't really need to wheel this jeep (I still have my XJ).

What would you do, and has anyone run 4.56 with 35s?

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Unread 08-08-2010, 08:23 PM   #2
Louie4
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I would do it right the first time and get 4.88's since you are planning on 35's and a 2.5L but that's just me. You'll save money in the long run.
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Unread 08-08-2010, 08:23 PM   #3
93TennYJ
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Go with the 4.88s. I am running 4.88s in my 93 and it makes a world of difference. With the 4.88s, I am back to basically the stock 4.10 ratio.
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Unread 08-08-2010, 08:32 PM   #4
Rons92yj
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I'm running 4.56s and wish I did more research. 4.88s is the way to go.
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Unread 08-08-2010, 08:36 PM   #5
MLJeeper
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There is simply not that much difference between the two ratios. If you had to gear both then yeah, i would think about 4.88s. But it would be a waste of money if one of the axles is already geared. 4.56s will do fine for 35s. Ive run them for years, no worries.
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Unread 08-08-2010, 08:41 PM   #6
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Quote:
Originally Posted by MLJeeper View Post
There is simply not that much difference between the two ratios. If you had to gear both then yeah, i would think about 4.88s. But it would be a waste of money if one of the axles is already geared. 4.56s will do fine for 35s. Ive run them for years, no worries.
I was kind of thinking there isn't much difference in the gearing, then again there isn't that much between 4.10 and 4.56...

I may just buy the 4.56 rear axle and if I am not happy with it I can sell the 4.56 gears and go 4.88 on both. At least selling the 4.56 I will be able to get about 75% of the cost of 4.88s back.

Also the 4.56 in the axle are Yukon gears and a bit nicer than the ones I would buy, due to the budget.
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Unread 08-08-2010, 08:44 PM   #7
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Quote:
Originally Posted by MLJeeper View Post
There is simply not that much difference between the two ratios. If you had to gear both then yeah, i would think about 4.88s. But it would be a waste of money if one of the axles is already geared. 4.56s will do fine for 35s. Ive run them for years, no worries.

This

and if you're still not happy with your 2.5's performance on 35's (and you won't) you can put the money saved toward an engine swap
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Unread 08-08-2010, 08:54 PM   #8
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4.88's, or if you can change the Dana 30 out, go lower.
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Unread 08-08-2010, 09:31 PM   #9
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Well I am re-geared to 4:88's w/ my 4 cyl and I am running 33's. I would not run 35's on anything less than 4:88's. Mine died when I went from 31's to 33's w/ 4:10, I then went to 4:88's and oh happy days. I think if you went to 4:56's w/ 35's you would not be happy. Just my 2 cents
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Unread 08-08-2010, 09:41 PM   #10
Destr0
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Well I just went to email the guy with the 4.56 8.8 and it sold this afternoon. I snooze, I lose.

I guess I am still hunting for an axle, although I know someone who has one that is 3.73 and ready to bolt in for cheap, so I may go for it and the 4.88s. If I go that route I will not be able to do the front axle right away. Although at the rate I am going I will have the money before the YJ is ready for the road/trails anyway. So far I have made some progress- bastard packs are assembled (need to take back apart for paint), have shocks all set to go in after repaint, have my shackles made and painted. I have also been spraying all the suspension bolts with PB Blaster for a week + now. Picking up my 4.0 TB and a 1" spacer on Tuesday. I have the 35s on D windows on the way. Tube fenders have been marked out on the fenders and I have my 1" tube. I am pretty much done with everything I can do without actually tearing into the YJ. Going to start tomorrow by removing the top and pulling all carpet and seats. Have a couple rust holes in the floors to patch.I have been delaying fixing these as long as possible because I have to learn how to weld... I have a Lincoln Mig I picked up for this projects, but I have never so much as turned it on. I did pickup a bunch of 16 and 14ga scrap to practice on... I will be working on the lift while waiting for paint/bondo to dry and if I get frustrated welding. I have a couple friends who are good welders, but I need to start doing it myself (my XJ bumpers all got welded by my friends, I cut and fit the pieces and had them weld them).

I also have a 1" BL but not going to put it on unless I need it for clearance w/ the 35s.

Going to do 8.8 as well as gears (looks like 4.88). I will probably keep the 2.5 for a year or two, although I have already been searching CL for a cheap XJ w/ 4.9 and AX15...

Cheers!
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Unread 08-08-2010, 10:01 PM   #11
Rons92yj
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Good luck with your build,sounds like you have some good plans.
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Unread 08-08-2010, 10:07 PM   #12
Destr0
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Thanks, this is my second Jeep build. My XJ is pretty much where I want it and I wanted YJ when I got it...


I will eventually go with a SYE, but at first I am going to try it as is (only going up 3.5" or so), if needed
i will do a temp TC drop.
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Unread 08-09-2010, 02:44 PM   #13
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Quote:
Originally Posted by plumber1 View Post
Well I am re-geared to 4:88's w/ my 4 cyl and I am running 33's. I would not run 35's on anything less than 4:88's. Mine died when I went from 31's to 33's w/ 4:10, I then went to 4:88's and oh happy days. I think if you went to 4:56's w/ 35's you would not be happy. Just my 2 cents
Well i daily drove it for years like that and averaged 16 to 17 mpg and could cruise 65 all day. Could go faster but the mpgs went to crap. Truth be known, if i wanted "good" power, i would choose neither 4.56 or 4.88s. Anyone whos drag raced knows there is not much difference in those ratios. sure every little bit helps, but not enough for the price tag on that extra ring and pinion and setup IMO.

Someone said throw a different axle in the front that could be geared lower. Thats the answer if you plan on sticking to a 2.5 and driving on the highway alot with tall tires. otherwise throw in a 4:1 tc kit and be done with it offroad.
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Your limited slip differential sucks.

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Originally Posted by Anticanman View Post
Any video of the sound?
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