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Old 04-23-2019, 06:20 PM
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Better gearing for my 94 yj

Have 1994 Jeep yj with 31s and a lift. wanting to know if I need to regear to make it crawl better or if I need to do something else. Does fine on highway and in mud and light rocks but doesn’t like going up obstacles

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Old 04-23-2019, 06:21 PM
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Has a 2.5 4 cyl in it

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Old 04-23-2019, 06:29 PM   #3
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Welcome to the Forum 95yj31s,

Sounds like your options are 4:56 or 4:88s.

Do you ever use 4LO?

Good Luck, L.M.
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1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 04-23-2019, 07:00 PM   #4
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besides gears a heavier flywheel would also help the little 2.5 Adding Flywheel Mass for Engine Torque - 4-Wheel & Off-Road Magazine
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94, 4.0/NV4500/NP231HD w/JB Conversions super short SYE, 4.5" Rubicon Express lift, JKS 1.25" body lift, Dana 489's w/OX lockers 4.88 gears, Tom Woods drveshafts, 35" BFG KM3's, WFO boomerang shackles, Warn XD9000 winch, Doug Thorley header, JBA mid pipe, Borla cat back.
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Old 04-23-2019, 08:27 PM
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Yeah I use 4 low When 4 high doesn’t cut it. If I go with the 4.88 gears do I just need to buy the gears or will I have to buy other things to make those gears work?
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Old 04-23-2019, 08:52 PM   #6
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I'm not being a smart aleck, but since your asking, it's probably above your pay grade. It's definitely above mine. Save up the $1000-1500 and pay the mechanic.
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Old 04-23-2019, 09:22 PM   #7
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Maybe he wants to raise his pay grade?

We all learned “righty tighty lefty loosey” at some point, everything else is just another step.
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Old 04-23-2019, 09:48 PM   #8
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Re-gearing our Jeeps is something many of us leave to professionals.

I recently had to choose between buying a gearset and installing it myself or having a professional re-gear my old heap.
While I felt confident that I'm capable of doing the job properly and having a good outcome, I would have had to buy several hundred dollars worth of special tools that (at my age) I'd probably never use again.
I was lucky enough to find a set of used axles in the ratio I was looking for for a fair price.

As Jarhead Al suggested, If you have to ask, you're probably better off paying to have the job done. There are a couple of guys around me that advertise on CL that re-gear 4X4s as a side job. Their advertised prices seem pretty competitive. If a person has the tools and some experience, it's not a terribly difficult job. It just requires attention to detail and a clear head.

The Factory Service Manual has a detailed description of the process, as do several manufacturers of gearsets. If you plan on attempting to do the job yourself, read several different versions of the instructions and watch a couple/few UTUBE videos before spending the money on parts and tools.

Good Luck, L.M.
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"Wrangler....It's not just a vehicle, It's a lifestyle".
.................................................. ........................
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 04-23-2019, 10:16 PM   #9
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Quote:
Originally Posted by Jarhead Al View Post
I'm not being a smart aleck, but since your asking, it's probably above your pay grade. It's definitely above mine. Save up the $1000-1500 and pay the mechanic.
I have to agree, Besides the Gears and the Master install kit, a few specialty tools will have you up past the learning exercise price tag and into Damn I bit off a little more than I can chew, unless you really know what your doing


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Maybe he wants to raise his pay grade?

We all learned ďrighty tighty lefty looseyĒ at some point, everything else is just another step.
I got no issues with pulling everything apart and putting it back together, but when it comes to the critical adjustments setting up the preload on the pinion without having a spare to practice on 1st. I'll save that skillset for another day
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Old 04-23-2019, 10:20 PM   #10
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Fwiw I almost never use 4 hi off road....
4 low w 4.10 gears and a 5 speed will get close to 50 mph....

Stop trying to crawl in hi range and you may find that yoi are just fine
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Old 04-24-2019, 08:32 AM
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I planned on buying the parts and having a mechanic do it since I’m not mechanically inclined
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Old 04-24-2019, 09:47 AM   #12
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I planned on buying the parts and having a mechanic do it since Iím not mechanically inclined
The best bet would be to discuss it with the mechanic before you order parts...
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Currently in the stable...
97 tj 2.5 5 speed stock... 97 tj 4.0 5 speed stock....04 tj 4.0 auto 4" and 33's... 98 tj roller for future build... 94 yj sahara 4.5" RE and 33's... 92 yj chev V8 3/4 ton axles and 38's... Cj5,7,yj,xj,ex mud dragster turned woods buggy

TJ dash speakers that actually rock! Kicker sub and amp in center console
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Old 04-24-2019, 12:42 PM   #13
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I regeared my 95 2.5 last summer because it was on my bucket list of things I wanted to do. I put out a few hundred dollars for tools and it took a few tries to get the backlash and the pattern right but I did it. Hardest thing for me was crunching the crush sleeve and the fact that not owning a lift, I had to pull the axle out to work on it. If I had a lift, I'd do all my regearing. The first time is always the hardest, not knowing how hard you have pound on inner pinion bearings and races to get them out and disconnecting rusted brake lines and such. But, I let the 4 wheel shop do the front end, once was enough for me. I'm 62 and just had back surgery, so my regearing days are over but I'm glad I did it once. I just picked up a 4.0L and I'm gonna have the shop put a set of 4.56s in it.
I regeared mine with 4.56s and I'm happy with that ratio. If you are going to make your Jeep a trail rig that doesn't see the road much, go with the 4.88s. But if you still plan to use it on the road alot, I would go with the 4.56s. If you decide you want to give it a wack, I have some tools I'll sell you! Taking it to the shop is probably your best bet but I admire guys who go for it. If it doesn't work out, you can always throw the axle in the back of a pickup truck and take down to the experts, but you'll probably need help lifting it, darn things are heavy.
Good luck whatever you decide!
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Old 04-24-2019, 12:58 PM   #14
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All that being said, I'm retired and have a lot of time on my hands and my 95 is not my main vehicle, so if yours is a daily driver or for any reason you can't have it tied up for a little while, definitely let the shop do the work. Heck, I probably didn't have that Jeep back on the road for a month!
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Old 04-24-2019, 02:57 PM   #15
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I wouldn't waste the money to go to 4.56 there's no gain in performance 4.88 would better.

Most shops will not warranty the work or parts when you bring in your own parts. If there is an issue with anything they will blame the parts you brought to them even if it's clear it was their mistake. You can tell them exactly what you want in brand names and quality and they should supply that to you.
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Old 04-24-2019, 03:38 PM   #16
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Installing gears is not that difficult if you have good mechanical ability it's just time consuming
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Old 04-24-2019, 05:41 PM
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Okay thanks. Is there a specific brand or anything you would suggest or will just some decently priced 4.88s be okay?
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Old 04-24-2019, 07:42 PM   #18
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Again, talk to your mechanic....
They tend to have preferred brands
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97 tj 2.5 5 speed stock... 97 tj 4.0 5 speed stock....04 tj 4.0 auto 4" and 33's... 98 tj roller for future build... 94 yj sahara 4.5" RE and 33's... 92 yj chev V8 3/4 ton axles and 38's... Cj5,7,yj,xj,ex mud dragster turned woods buggy

TJ dash speakers that actually rock! Kicker sub and amp in center console
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