Is a regear worth the money? - JeepForum.com
 
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post #1 of 13 Old 08-04-2013, 08:49 AM Thread Starter
Bmann412
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Is a regear worth the money?

I have a 1998 2.5l with 3.73 gears and 33x12.5 km2's (auto transmission) I have been told that I should regear to 4.56. Would I notice a diffrence with this change because the only time I notice my jeep being slow is on the highway. Would a regear help with acceleration? This is mainly my dd and will be driving to college every day so would a regear help with mpg? Sorry for so many questions but it seems like a lot of money for something I might not notice.

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post #2 of 13 Old 08-04-2013, 08:55 AM
IrishRED
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In my opinion it depends on how long you plan to keep it. Re-gearing can be expensive ( +/- $1100 ) but it does help. Personally I would go with 4.88s, not 4.56. For a daily driver it makes sense but that amount of money put in is not worth it if you plan on getting rid of it soon. As a long term investment I say it is definitely worth it. I say this as I am still trying to scrape the money together to do this myself!

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post #3 of 13 Old 08-04-2013, 10:08 AM Thread Starter
Bmann412
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Quote:
Originally Posted by IrishRED
In my opinion it depends on how long you plan to keep it. Re-gearing can be expensive ( +/- $1100 ) but it does help. Personally I would go with 4.88s, not 4.56. For a daily driver it makes sense but that amount of money put in is not worth it if you plan on getting rid of it soon. As a long term investment I say it is definitely worth it. I say this as I am still trying to scrape the money together to do this myself!
why would u go with 4.88?
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post #4 of 13 Old 08-04-2013, 10:21 AM
tjcj
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Quote:
Originally Posted by Bmann412 View Post
why would u go with 4.88?
Because with your 4 cylinder and auto it would be a better combo than 4.56.

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post #5 of 13 Old 08-04-2013, 10:23 AM
samuraisavr
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In order to get the overall gear ration back to stock-ish, you'd need to go to 4.88's or very close to it. The 4.56 ratio would still be under geared.

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post #6 of 13 Old 08-04-2013, 10:48 AM
Imped
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If he had an OD then 4.88 would be the correct choice. But he doesn't so 4.56 is the correct choice with 33" tires.

Is it worth it? Absolutely. Will you see an increase in mileage? Not enough to ever cover the cost of the gears.

Are you sure you have 3.73 gears? If you really do, you could always pull a set of axles from a manual 4 cylinder TJ. They've got 4.10 gears and while that's not perfectly ideal, it would be an improvement and would likely be much cheaper than new gears in your current axles.

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post #7 of 13 Old 08-04-2013, 10:58 AM
Jerry Bransford
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Regearing is the best way to get an immediate MAJOR improvement in performance after installing big tires.

For 33" tires, 2.5L engine and your 3-speed automatic, you want 4.56 gearing in your axles. For others with the 5-speed, 4.88 would be the way to go with the 2.5L engine but your 3-speed automatic transmission doesn't have an Overdrive so 4.56 is definitely the appropriate/best ratio.

The dramatic improvement in power and highway performance after installing 4.56 gearing will put a big grin on your face.

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post #8 of 13 Old 08-04-2013, 11:54 AM
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Re-gearing is most definitely worth the money... Nothing else you can do to that engine will give you the same bang for buck on the butt dyno, and overall driveability of the Jeep. And then, anything you do in future to increase the output will still benefit from the gearing.

Only reason not to do it would be if you plan on swapping out the axles.
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post #9 of 13 Old 08-04-2013, 12:16 PM
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Don't have the same setup as you but it with a 4.0 and manual I was running around in 4th gear on the freeway getting 11-13 mpg. Getting 16-17 with 4:56. I'm comfortably cruising at 65 around 2400 rpm now in 5th. Best money I spent.
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post #10 of 13 Old 08-04-2013, 12:20 PM
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I also geared my 2.5 manual to 4:88... running 33" tires and have a decent amount if power. Very happy I did the swap! Cost me around 500.00 all new bearings seals and gears. Oh and I went ahead and threw in a powertrax no slip locker up front while I had it apart. No ill effects from the locker. Can't even tell its in there till you put it in 4X4.

If you have jack stands....a wrenching know-how....and access to a dial torque wrench, then time and the internet will be all you really need. Many write-ups and tips to help u get thru it. Oh and access to a press...yeah u will need that!

Its really not that hard to do...especially if you are using the same carriers.

If you decided to DIY, pm me with any questions and I will try and help.
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post #11 of 13 Old 08-04-2013, 10:19 PM
jeepwrangler97
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Quote:
Originally Posted by Imped View Post
If he had an OD then 4.88 would be the correct choice. But he doesn't so 4.56 is the correct choice with 33" tires.

Is it worth it? Absolutely. Will you see an increase in mileage? Not enough to ever cover the cost of the gears.

Are you sure you have 3.73 gears? If you really do, you could always pull a set of axles from a manual 4 cylinder TJ. They've got 4.10 gears and while that's not perfectly ideal, it would be an improvement and would likely be much cheaper than new gears in your current axles.
The 2.5Ls with the 30rh had 3.73s. I used to have the same setup

Op: I had that setup with 31s...good luck..mine couldn't get out of it's own way with that setup

I'd go with 4.56, if I were in your position, or get some take offs with 4.10s

Fwiw, even with my 4.6L, I kind of wish I had gone to 4.10 when I put in my 8.8

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post #12 of 13 Old 08-04-2013, 10:23 PM
2k2wranglerx
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A 4cyl and 33s brings so much suck on the highway id take as much gear as I could get.

My friend Kelly did 4.56s and 33s on her auto 4 cyl and she was still in the right lane with the big trucks on long hills. I'd want all the gear I could get. And the lightest wheels I could get.

Of course that rig was eventually painted pink and hammered on for crawl to cure cancer...

93 yj. 355 chevy, heads, cam, intake, etc. 35's, bumpers, winch, lights, and a killer stereo.
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post #13 of 13 Old 08-05-2013, 08:53 AM
LiveAndLearn
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I have a 6cyl, came with 3.07 D30/35. I payed a friend 1500 to swap axles with him before he took his jeep and sold it to the dealership. It had D44/D30 with 4.88, chromoly 33 spline shafts, and detroit lockers. This was by far the best investment I have ever made in my jeep.

1997 TJ - 4.25 lift, 4.88, D30 w/ Detroit, D44 w/ Superior'ed Detroit and 33 spline shafts, Currie track bar, Warn XD9000i, Currie Tire Carrier, full armor and tube fenders, full custom trunk, Tom Woods shafts, AA SYE, Currie control arms, and Rigid lights. BIG BLACK is my baby.
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