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Unread 04-04-2010, 07:21 PM   #1
mb1440
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4.88 or 4.56 95 yj 2.5

I am wondering if I should go with the 4.88 or 4.56 in my 95 yj,2.5, 5 speed. I am only running 32x11.50 tires and will not go any bigger. I do not want to much gear. My jeep is driven on the road and sand no mudding.There is about $150 diff in the price of the gear sets. 4.56 being cheaper.

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Unread 04-04-2010, 07:27 PM   #2
MLJeeper
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There is not much difference between the two sets. Generally, i would recommend you go as low as you can so i would say 4.88s. I have no clue why there is a price variation like that between the two ratio/sets. Its one used or something?
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Unread 04-04-2010, 07:41 PM   #3
Tom95YJ
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4:56 for auto 4:88 for manual I'd gear for 33's cause we all feel the need to go bigger sooner or later . Im saving for my next phase of the Jeep so I need to decide between 37's or 40's
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Unread 04-04-2010, 07:49 PM   #4
Jim93YJ
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I regeared to 4.56 but there are factors to consider for your particular application. With me and where I live with my terrain I wanted to remain in 4th gear for most of my in town cruising since that is the strongest (1:1) gear mesh within the AX-5. It puts me at just the right RPM so I get a balance between gas mileage and power. I also wanted the option to upgrade my engine in the future without having to drive around with huge tires or regear to lower gears. Ultimately you need to work out your RPMs and see what you are happy driving around town with in terms of resulting power you will have available, gas mileage, most used driving gear, engine wear, future upgrades, etc. There are RPM calculators online.
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Unread 04-04-2010, 08:04 PM   #5
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If you plan to keep teh 2.5L forever go ahead and regear to 4.88s You won't be happy with 4.56s, there won't be too much of a difference.

But it really all depends on what kind of driving you do mostly.

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Unread 04-04-2010, 08:25 PM   #6
ionakana
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I assume you have 4.10 now. Go 4.88. You'll be pissed for spending the money on 4.56, there won't be a lot of difference than what you have now. I would like to know why the 4.88's cost another $150 too, there shouldn't be any difference.
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Unread 04-05-2010, 08:50 AM   #7
mb1440
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I do not know why ther is a price diff. but looking at La Vegas drivetrain there is a gap between the 4.56 and 4.88. The 4.56 are about $390 or so inc. master install kits the 4.88 are about $495.???????
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Unread 04-05-2010, 09:49 AM   #8
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This is a pretty good gear calculator with alot of different options for figuring.
Gear Calculator
If you have 4:11's already,i would go with 4:88's,not much of a difference in the 4:56's to the 4:11's.
Use a gear calculator to figure the RPM ranges needed with you're power ranges in the engine compared to the normal speeds you drive.
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Unread 04-05-2010, 12:07 PM   #9
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lPersonal experience: I was going to go with 4.88 but the shopped talked me in to 4.56... It works ok but with any headwind on the Interstate and I cant do better than 60ish in 5th, and there isnt much get-up-and-go around town. So I would definitely say go with 4.88, even if it is a little more money.
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Unread 04-05-2010, 12:31 PM   #10
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I think you are getting some marginal advice in this thread. My opinion is that with 32 inch tires 4.88s is too low for the highway. That gearing will raise your RPM higher than the stock gears with the stock tires. I had 4.88s on 33s before I went to 35s.

I'm not even going to get into the whole discussion of the mistake you are making re gearing a D35...don't do it.

Frankly since you don't plan to get bigger tires you need to stick with what you have because it isn't that bad with 32s.

If you insist on regearing I would find a used set of axles that are already regeared. It will save you money in the long run.
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Unread 04-05-2010, 01:11 PM   #11
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I think you are getting some marginal advice in this thread. My opinion is that with 32 inch tires 4.88s is too low for the highway. That gearing will raise your RPM higher than the stock gears with the stock tires. I had 4.88s on 33s before I went to 35s.

I'm not even going to get into the whole discussion of the mistake you are making re gearing a D35...don't do it.

Frankly since you don't plan to get bigger tires you need to stick with what you have because it isn't that bad with 32s.

If you insist on regearing I would find a used set of axles that are already regeared. It will save you money in the long run.

Well my line of thinking is 4 banger and more power. Unless he drives like a madman hes not going to butcher his gas mileage bad going lower than 4.56s. There just isnt that much of a difference between the two ratios. The other part is the I wont ever go bigger than 32s line. I remember i said that about 31s, then 33s and now im eyeing a swap to go bigger than 35s. Its a frigging disease. Just trying to save the guy money
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Unread 04-05-2010, 03:12 PM   #12
provinT13
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I agree with paultyler. For the 2.5L, 4.88's and 33's is the common set up.
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Unread 04-05-2010, 04:10 PM   #13
clemsonfan16
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Dont polish the turd man. But if you DO... i would go 4.88s. That will help if you want to go bigger in the future. But hopefully you will do an axle swap...hopefully......
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Unread 04-05-2010, 08:03 PM   #14
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I don't know about 4:56's but I was running 31's w/ 4:10's and it was fine. I then went to 33's and the little guy just about died. Went to 4:88's and life was back, even better than with the 31's & 4:10s. It now drives like it did when it was running 28's. I know that w/ 32's you must have lost some power, problem is you may be in between tire sizes and gear sizes. Check out some of the gear calculators that have been suggested. You may want to see if you have anyone you can borrow there 31's for a test run and see how it drives power wise compared to your 32's. This may give you the same feeling as 32's w/4:56's.

Also as other have stated you always seem to want to go to the next size. I know I did, I thought hell 31's are fine, I now have a set of 31's w/7k miles on them for sale, and am thinking maybe 35's I also thought hell this little guy off roads pretty well stock w/ 31's So why do I now have 33's and lockers front and rear And as other have said it is a disease, get vaccinated and get out quick.
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Unread 04-05-2010, 09:35 PM   #15
Matt_vs_YJ
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I've been running 4.88's with 32's for quite a while now. It's not too low for the highway, and I still find myself dropping to 4th gear on steeper sections of highway (bridges, ect).

I say 4.88, but don't pay 495 for them unless that price is for both axles! There's several vendors over on Pirate that will sell gears and install kits for around 250/axle, I'm not sure if the same folks are here on Jeepforum (Wayne Hartwig is who I recommend).
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