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Old 10-05-2014, 10:20 PM
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Smile YJ Regear

Hey guys. I'm new to this forum, and pretty new to jeeps in general. I have a 1994 Yj that my grandfather said I could have if I could get it running-which I did-but I've been looking into getting more power out of it so I can lift it and whatnot. Its a 2.5 liter 4-cyl 5-speed on 31" tires and it drives fine, but I really wanna put a 3 or 4" suspension lift on it, but from what I've been told thats a bad idea due it being a 4 cylinder. That it'd have terrible mileage and have trouble pulling a hill. The extent of any off roading I would do would be trailing and a little mudding here and there. I dont intend to go bigger on the tires though. But ill also be driving on highways almost as much as in the city.
From what I've read and gathered, you can regear it and get good performance on lifted 4 cylinders. So can anyone help me out on explaining how it works, what all is involved, what the difference is on different number gears (3.07, 4.10, 4.88, etc), and also I see people talking about Dana 30 this, Ford 8.8 that, but I don't know what they're really talking about. Obviously I dont plan on doing the regear myself, but if I end up calling a shop, I wanna know what I want and what I'm talking about.
sorry if I sound like a newb to all of this, I'm learning.
its a beautiful jeep, and all of this is exciting.
I really appreciate it to anyone who helps!
thanks,
Jonah

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Old 10-06-2014, 05:13 AM   #2
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I am positive that if you are lifting it yet keeping the stock size tire "no clue why you would want to do that" but to each their own. I am sure you will not need to regear at all. It's not the lift that causes this issue its the size tires. Anything over a 33" tire is pretty much a must on regear. I have a 3 inch lift and have 33's with stock gears and I run fine besides hills she gets a little sluggish.

Let me just add that the reason for lifting your jeep usually is to clear larger tires which lifts the jeep more allowing you to clear larger objects

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Old 10-06-2014, 09:37 AM
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well the stock tires on it were 225's but I changed them out for 31" tires, but they look pretty stuffed in there. And Im pretty sure if I go over a speed bump too quickly, it'll scrub. Which would be fine if I was only driving on paved roads, but I do plan on occasionally taking it off road. So if ill be okay lifting it with 31's and not needing to regear than thats cool, I just wanna make sure I'm not gonna put too much strain on the jeep. And even if I don't need to regear, id still like some kind of explanation of how it works and stuff.
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Old 10-06-2014, 03:18 PM   #4
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Like I said about my 33's I don't feel it bad enough to need re-gearing but I also have a 4.0 if it just feels too weak with the 31's than its probably a good idea to do it. But yea a couple inch lift is not going to make a difference for that. If it needs to be re-geared you should know now.
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Old 10-06-2014, 03:40 PM   #5
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I've owned 2 2.5l powered jeeps with 33-35" tall tires. Regearing is a must do ! The 4 cylinder would need 4.88 gears. People who say you don't need to regear and that it's fine generally have never driven a jeep that has been properly regeared. Then once they do they are like why didn't I do this earlier !


Your jeep will have 4:10 gears. And a 28-29" tall tire stock. Now changing to a 33" tire and 4.88 gear the deeper ratio will make up for the difference in tire diameter and get you back into the stock rpm band with the taller tire.

As far as upgrades to make power gears will help you more then anything. I spent tons of money on headers full exhaust systems, 19lb injectors bored throttle body's, e fans , camshaft, roller rockers........ And the gears gave the most help . The red YJ pictured had 4.88's and 35's for 8 years before I sold it I drove it across country twice while pulling a smAll trailer.
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Old 12-09-2017, 12:54 PM   #6
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I've owned 2 2.5l powered jeeps with 33-35" tall tires. Regearing is a must do ! The 4 cylinder would need 4.88 gears. People who say you don't need to regear and that it's fine generally have never driven a jeep that has been properly regeared. Then once they do they are like why didn't I do this earlier !


Your jeep will have 4:10 gears. And a 28-29" tall tire stock. Now changing to a 33" tire and 4.88 gear the deeper ratio will make up for the difference in tire diameter and get you back into the stock rpm band with the taller tire.

As far as upgrades to make power gears will help you more then anything. I spent tons of money on headers full exhaust systems, 19lb injectors bored throttle body's, e fans , camshaft, roller rockers........ And the gears gave the most help . The red YJ pictured had 4.88's and 35's for 8 years before I sold it I drove it across country twice while pulling a smAll trailer.

You sir are a hero. You've given me the confidence to put money into my 2.5 4cyl and not be ashamed of it lol question ? Did you keep the stock ax5 transmission on it ? Or does that all change out once you regear? (im new to regearing as well)
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Old 12-09-2017, 01:27 PM   #7
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Maybe I should wait and let Tom guide you through this, but a Regear is just changing the Ring and Pinion gears in the differentials, not the transmission. It's like running higher rpms in all gears for a given speed in each, higher rpms means less strain on the engine for that speed over ground. When you install taller tires they are bigger around and travel more inches per rpm, so for the same engine rpm the car is moving farther up the road, installing a larger Number Ratio gear put you back to the right engine rpms for your ground speed. A 3.07 to 1 ratio means the driveshaft turns 3.07 rpms to 1 rpm of your axle, likewise a 4.88 to 1 ratio turns the driveshaft 4.88 rpms to 1 rpm of your axle. I hope this helps, and maybe someone can explain this better.
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Old 12-09-2017, 06:22 PM   #8
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Think of it like a mountain bike with different gears..your legs are the motor. In one gear it’s very hard to get going and your legs are working very hard! In another gear...not so much


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Old 12-09-2017, 06:47 PM   #9
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Echoing others that gears are a must. I added 33” tires to my YJ with stock gears. Once I regeared it was a night and day difference. It is most noticeable when starting from a dead stop.

Also, when it comes to lifting make sure you do your research and get a good kit that has everything you need. I lifted mine with a 2.5” kit and went cheap with TrailMaster. The shocks that came with it were awful and I also needed a transfer case drop which wasn’t included in the kit.

Just do it right and you’ll be glad you did.


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Old 12-10-2017, 03:02 AM   #10
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Echoing others that gears are a must. I added 33” tires to my YJ with stock gears. Once I regeared it was a night and day difference. It is most noticeable when starting from a dead stop.

Also, when it comes to lifting make sure you do your research and get a good kit that has everything you need. I lifted mine with a 2.5” kit and went cheap with TrailMaster. The shocks that came with it were awful and I also needed a transfer case drop which wasn’t included in the kit.

Just do it right and you’ll be glad you did.


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I have 31" tires on stock gear ratios and i max out at 75 -80 on highways downhill. And i always start from 2nd gear bc its so hard to smoothly transition from 1st to 2nd to 3rd naturally. Id love to regear to 4.88 and have more acceleration pulling out from 2nd gear at a dead stop
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Old 12-10-2017, 03:03 AM   #11
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Also, when it comes to lifting make sure you do your research and get a good kit that has everything you need. I lifted mine with a 2.5” kit and went cheap with TrailMaster. The shocks that came with it were awful and I also needed a transfer case drop which wasn’t included in the kit.

Just do it right and you’ll be glad you did.


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Which kit did you use ?
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Old 12-11-2017, 11:15 AM   #12
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I have 31" tires on stock gear ratios and i max out at 75 -80 on highways downhill. And i always start from 2nd gear bc its so hard to smoothly transition from 1st to 2nd to 3rd naturally. Id love to regear to 4.88 and have more acceleration pulling out from 2nd gear at a dead stop
You need to use first gear. If your having problems shifting it you either need to practice driving a manual more or something is not right with your clutch or transmission. That being said your going to burn up or cause excessive wear on your clutch starting in second all the time.
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Old 12-12-2017, 01:27 AM   #13
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You need to use first gear. If your having problems shifting it you either need to practice driving a manual more or something is not right with your clutch or transmission. That being said your going to burn up or cause excessive wear on your clutch starting in second all the time.
You're right I've only been driving manual with this jeep for a total of 6 months. It just seems like 1st gear in a YJ lasts for like 2 seconds and Im not smoothly pulling the clutch down to second in time without jerking. I feel like i have more time in each of the other gears for smooth transistions. Maybe it's because I'm a noob, maybe its because of my clutch. not sure, but my mechanic says the clutch is fine.
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Old 12-12-2017, 05:49 PM   #14
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I have the same set up as yours, and my yj would not be very happy with me if i did 2nd gear starts. With the 31 wheels and 4.10 gears 1st is a must for clutch life.
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Old 12-12-2017, 09:00 PM   #15
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I'm currently driving a 2.5L YJ with a stock AX5 trans, NP231 tcase, and stock axles with 4.10s pushing 33" KM2s down the highway. I agree with the others that say you only need to regear if you go up in tire size. For mileage, the best I've seen in my Jeep since I got it road worthy this past September is 19 mpg. That was coming back from backpacking in the Smokies, so lots of downhill coming home. I've averaged 15.571 mpg across 9 full tanks and a little over 1200 miles since it's been road legal again.

I would like to put 4.88s in mine, however I need to do the 8.8 axle swap before I regear so I don't have to regear 2 rear axles. I'm not swapping the D35 out for any reason other than I plan to tow a small trailer around the country for an extended road trip, and the D35 is not rated for towing as far as I know.

For trailing and a little mudding the D35 should be fine if you take care in picking a good line and not bouncing on it. I drove mine all over the original Tellico back when I was in school out there with no breakage. I aired down the 33" Trxus MTs to 10psi, picked good lines, and everyone was asking how I got up the trails I did without a locker.

Some friendly advice on shifting: Unless you're on a drag strip you shouldn't be hammering the throttle to the floor and banging through the gears. Even then, why would you be on the drag strip in a vehicle with the aerodynamics of a cardboard box? lol Anyway, I rock my foot on and off the accelerator slowly/smoothly, almost as if I'm using a wah pedal, between shifts. Also, please don't do what a lot of us did to our Jeeps when we were younger and getting the hang of shifting, such as dumping the clutch, racing friends' hondas, rangers, sunfires, etc.

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