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Old 01-10-2009, 01:14 AM   #1
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Gear Ratios

I have a 01 TJ with manual and 4.0. It has the sucky 3.07 gears in it and I want to upgrade due to a 3 inch body lift and 32's. What ratio would you guys recommend?

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Old 01-10-2009, 11:24 AM   #2
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First, avoid a 3" body lift. 1" body lifts are fine, 2" are too when absolutely necessary. But a 3" body lift is just not the way to go for your TJ. Not only are 3" body lifts a bad way to go, they are a ROYAL PITA to get installed properly due to all the mods you have to do to things like the fuel lines, transmission shifter, transfer case shifter, etc. A 2" budget-boost is actually a better way to go (which consists of 2" spacers you put on top of your springs) for 32" tires.

A 4.10 ratio would be fine for 32" tires for nearly any kind of wheeling. This ratio recommendation assumes your TJ has a 5-speed transmission.

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Old 01-10-2009, 11:35 AM   #3
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ya, definitely avoid the 3" BL. it is not really functional and it is fugly. you might also want to consider going w/ 2" lift springs instead of the spacer lift. i costs a little more but it allows you to fit 32" tire w/o any rubbiung issues. i have teh 2" space lift and i would only really go w/ 31" tires. my husband had a tj w/ the 2" lift springs and teh 32"s fit great. as far as gear ratios go id recommend either the 4.10's or the 4.88's
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Old 01-10-2009, 07:11 PM   #4
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I had the same 3.07 gears in my 99. They sucked. I just finished doing the mods. I did a 2" BL and a 2-1/2" suspension lift from Rough Country. This allowed me to put on 33" mud terains. As far as gears go I went with Yukon 4.11s with a posi locker in the rear all from Randy's Ring and Pinion. You will need to get a carrier for the front also. The Jeep is AWESOME!!! I went climbing snow piles in the Home Depot parking lot last night. Cost wise....

2" BL $80.00
Suspen Lift $300.00
Gears $500.00
Tires and wheels $650.00
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Old 01-11-2009, 10:58 PM   #5
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Thanks for the responses! Unfortunately, I bought the Jeep 2 years ago and it already had the 3" BL on it so for now I have to live with it until I can afford to chage it. I put the BFG AT 32 x 11.50 on right after I bought it and I cannot keep it in 5th gear. I too was thinking 4.1 or possibly a 3.73 ratio but I wanted some input from others who have done it. Any idea how much the front and rear gears would cost installed? Again, Thanks!!!
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Old 01-12-2009, 11:20 AM   #6
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I would call around in your area and see what the cost is to install. Ask them what the time to install and their hourly charge is and also get a quote for if you have the parts on hand and a seperate quote if they provide the parts. Randy's Ring & Pinion This is the web site for the above mentioned Randy's ring and pinion. They are really good people. Just call them and tell them that you need ring and pinion for front and rear as well as a front carrier. The rear (I went with) is a posi lock. They gave free shipping too. Good luck.
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Old 01-12-2009, 11:42 AM   #7
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Is that your jeep in your avitar? Because it doesn't look like a 3" body lift in that pic. Maybe it just the tiny picture making it look that way.
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Old 01-12-2009, 04:23 PM   #8
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Little random but 4point I LOVE YOUR QUOTE! LMAO
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Old 01-12-2009, 04:51 PM   #9
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Quote:
Originally Posted by 01 TJ View Post
Thanks for the responses! Unfortunately, I bought the Jeep 2 years ago and it already had the 3" BL on it so for now I have to live with it until I can afford to chage it. I put the BFG AT 32 x 11.50 on right after I bought it and I cannot keep it in 5th gear. I too was thinking 4.1 or possibly a 3.73 ratio but I wanted some input from others who have done it. Any idea how much the front and rear gears would cost installed? Again, Thanks!!!
That's weird, I have 3.07's too and I can cruise 70-75 no problem on the freeway in 5th, and I have 33's. Maybe its the exhaust and headers?
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C8.25, Powertrax locker
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33" BFG A/T's 15" soft 8's
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trimmed fenders, CB, exhaust, lights, remote locks and start, etc.
Past jeeps:97 TJ, 99 TJ

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In video games, the bad guy's bullets travel much slower than the good guy's bullets.
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Old 01-12-2009, 04:58 PM   #10
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That's weird, I have 3.07's too and I can cruise 70-75 no problem on the freeway in 5th, and I have 33's.
Having driven that combination several times on new Jeeps I had built for customers in my previous job, I don't understand how you can feel your performance is even close to being adequate. Is that with a manual tranny and are you absolutely certain you have 3.07 gearing?
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Old 01-12-2009, 05:15 PM   #11
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Originally Posted by Jerry Bransford View Post
Having driven that combination several times on new Jeeps I had built for customers in my previous job, I don't understand how you can feel your performance is even close to being adequate. Is that with a manual tranny and are you absolutely certain you have 3.07 gearing?
Yes I have a manual and before I got it the jeep, the differentials had never even been opened. Unless they offered another gearing from the factory for the sport, I have stock gearing. I only have to downshift for long or especially steep hills, even if I leave it in fifth, I won't go far if at all below 65.
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1991 XJ Cherokee, 4.0, AW4, NP-242, SYE
HP D30, Rusty's axle truss, Currie HD steering, diff. slider
C8.25, Powertrax locker
4.5" RE up front and Rough Country out back
33" BFG A/T's 15" soft 8's
Suspension seats, rock sliders, plated rear corner panels,
trimmed fenders, CB, exhaust, lights, remote locks and start, etc.
Past jeeps:97 TJ, 99 TJ

Quote:
Originally Posted by Geoff@Bestop View Post
In video games, the bad guy's bullets travel much slower than the good guy's bullets.
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Old 01-12-2009, 05:22 PM   #12
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Originally Posted by ExDementia View Post
Yes I have a manual and before I got it the jeep, the differentials had never even been opened. Unless they offered another gearing from the factory for the sport, I have stock gearing. I only have to downshift for long or especially steep hills, even if I leave it in fifth, I won't go far if at all below 65.
Sports came standard with both 3.07 and 3.73 gearing, I'm betting you have 3.73.

Look on your differential cover where at the 9 o'clock position you'll find your ratio tag like below.
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Old 01-12-2009, 05:48 PM   #13
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Just went out and checked it, says 3.07.
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1991 XJ Cherokee, 4.0, AW4, NP-242, SYE
HP D30, Rusty's axle truss, Currie HD steering, diff. slider
C8.25, Powertrax locker
4.5" RE up front and Rough Country out back
33" BFG A/T's 15" soft 8's
Suspension seats, rock sliders, plated rear corner panels,
trimmed fenders, CB, exhaust, lights, remote locks and start, etc.
Past jeeps:97 TJ, 99 TJ

Quote:
Originally Posted by Geoff@Bestop View Post
In video games, the bad guy's bullets travel much slower than the good guy's bullets.
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Old 01-12-2009, 07:10 PM   #14
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i also have the 3.07s and dont have any issues with speed long hills arnt even a problem. 32/11.50 mtrs. even befor i installed the trail jammer kit i had no problems on hills. so i am happy with mine where they are
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Old 01-12-2009, 11:25 PM   #15
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Give it time my friends give it time..Sometimes you dont realize that your Jepp is runing slugish, but then you will start to hear noises..You might not have a problem up front..Like when the first engine came out it lasted 20,000 miles because they never had something called a oil filter but after the filter and a few oil changes your jeep will last alot longer..Anybody following me lol
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2" Skyjacker Body Lift
ARB Front bumper
2 IPF Fog Lights
35" Hankook
Dick Cepek DC-1's
Flowmaster Catback
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Old 01-12-2009, 11:39 PM   #16
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Give it time my friends give it time..Sometimes you dont realize that your Jepp is runing slugish, but then you will start to hear noises..You might not have a problem up front..Like when the first engine came out it lasted 20,000 miles because they never had something called a oil filter but after the filter and a few oil changes your jeep will last alot longer..Anybody following me lol
I'm following you. A man used to sleeping in the mud and being trampled by wild beasts will think a stone bed a paradise and an undeserved luxury.
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Old 01-12-2009, 11:54 PM   #17
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Yes it is a 3 inch BL. But the pic is too far away. As for the 5th gear questions, I can go 70-75 in fourth no prob but as soon as I shift into 5th it slows down. The axle tags are 3.07. I am not trying to make a race car out of it. I just want to be able to use all 5 gears!
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Old 01-13-2009, 02:50 PM   #18
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Quote:
Originally Posted by Jrzymilitia View Post
Give it time my friends give it time..Sometimes you dont realize that your Jepp is runing slugish, but then you will start to hear noises..You might not have a problem up front..Like when the first engine came out it lasted 20,000 miles because they never had something called a oil filter but after the filter and a few oil changes your jeep will last alot longer..Anybody following me lol
I know what you mean, coming directly from a 4 cylinder, my 99 is fast. But compared to other cars I've had or been accustomed to driving, my 99 is slow. My Ford Ranger had noticeably more power, and I drove my mom's Mazda 6 for a while while I was looking for another car and that thing is fast by most standards. So I realize that my Jeep is slow, and will be slow until I get 3 throttle body spacers and those fuel line magnets.

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1991 XJ Cherokee, 4.0, AW4, NP-242, SYE
HP D30, Rusty's axle truss, Currie HD steering, diff. slider
C8.25, Powertrax locker
4.5" RE up front and Rough Country out back
33" BFG A/T's 15" soft 8's
Suspension seats, rock sliders, plated rear corner panels,
trimmed fenders, CB, exhaust, lights, remote locks and start, etc.
Past jeeps:97 TJ, 99 TJ

Quote:
Originally Posted by Geoff@Bestop View Post
In video games, the bad guy's bullets travel much slower than the good guy's bullets.
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