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Old 10-14-2013, 04:04 AM   #1
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Cool Jeep TJ Gearing upgrade

About a month ago I added a Skyjacker 2' Spring Spacer lift kit with Nitros shocks to my 1997 TJ. I replaced the 30x12.5x15's with 33x12.5x15's.
I am not sure if I need to upgrade the gearing or not.

Can anyone suggest what gearing is preferred or what I should use with my existing setup? Everything on my jeep is stock.

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Old 10-14-2013, 06:03 PM   #2
Guesses a lot ;)

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With the auto you might be ok. A guy I run with just went 4.56 in his tj on 33s and it totally changed the jeep for the better. His is a 5 speed though.

You want to completely figure out what you want to do with the jeep before you re-gear. Its pretty expensive and odds are your gonna run those 33s for a while and decide 35s would be nice to have with a few more inches of lift and a D44 or 8.8 among other things.lol

I have the tf999 in my yj and 3.55s. It does ok with 35x13.5 MT's. Its no power house and I shift it down manually on hills and stuff cause the torque flights are famous for not shifting down and getting hot... Im gonna go to 4.88s when I do the next stage of the build.

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Old 10-15-2013, 04:46 AM   #3
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OregonPlinker,

Thank for the information. If you haven't guessed, I'm very new at this and trying to learn as much as I can in a very short time span.

I am still trying to figure out what stock gears and axels I have.

I think I will be staying with the 33's I have forever. It's high enough for what I need to do with it, light to mild off-road, climb hills and drive trails in the jungle environment. I have plenty of top end speed but would like to increase the bottom end.

Several others have suggested that I run the 4.10 gears in both the front and rear?
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Old 10-16-2013, 11:15 PM   #4
Guesses a lot ;)

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Depending on how much your jeep has been worked on it might still have tags on the differentials for identification. I would guess it has the D35 D30 combo. I think the Sport's and Sahara's came standard with a D44 rearend. Dont hold me to that cause Im no expert...

As far as the gearing goes, Im not sure but I want to say you have 3.07 or 3.73. If its 3.73 changing to 4.10 wouldnt be worth the money in my opinion. If its 3.07 it would make quite a difference to go with 4.10. You have to run the same gear ratio in front and rear no matter what.

I think the 30rh is quite similar to my tf999. If so, it has a low 1st gear and low 2nd gear for off road stuff and then drive is quite a bit higher for on road travel.

You can go to moparownersconnect.com and sign up, enter your VIN number, and you'll get a list of every option that your jeep came with..including gears.. Official mopar site.

Also when your posting on here for something like this you should post in the TJ section. You'll get response from the TJ gurus...lol
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Old 10-16-2013, 11:20 PM   #5
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Quote:
Originally Posted by Okinawa TJ1 View Post

Several others have suggested that I run the 4.10 gears in both the front and rear?
For the 3 speed auto and 33s. 4.10 gears are what you want.
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Old 10-16-2013, 11:25 PM   #6
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If you can find some junk yard axles out of a 4cyl tj they more then likely already have 4.10. Btw dana 44 was an option, most of us were stuck with d35 from factory.
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Old 10-18-2013, 05:22 AM   #7
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Thanks...

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