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Old 03-07-2014, 08:02 PM   #1
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Gearing for 33s.. HELP!!

Hey guys!
I have a 91 yj and I'm running 33s on a 4 inch lift with stock gears and axles. I want more power, at least back to factory or even a little more. However, I'm not sure how to go about it. Do I only need to change the ring and pinion and that's it? Or is it more complicated? And what is recommended for my ratio??

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Old 03-07-2014, 08:37 PM   #2
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Depends on what motor you have. I have a 4.0 liter 4.10's in my axles with a 4" lift and 33's and I can do 70 no problem without having to downshift. You'd probably want to gear lower if you have a 2.5 liter however.

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Old 03-07-2014, 09:16 PM   #3
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I'm running 4.56. Freeway speeds drain the gas tank quick. But I have no problem turning the tires in the mud or crawling.
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Old 03-08-2014, 10:59 AM   #4
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2.5 with 4:88s she will run 70 on the flat no problem and it is better on the hills. It is singing at at 70 running 3K but it does just fine. Great on the trail.
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Old 03-08-2014, 12:42 PM   #5
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To answer your question, ring and pinion are the only things that you have to change, if you have a 4cyl. The 2.5L has 4.10 gears stock, and needs to have 4.88's in order to turn 33" tires effectively.

Now if you have a 6cyl the stock ratio is 3.07, and then you will need a new carrier in the axle along with 4.10 gears. The carrier break is 3.53 and down, and 3.73 and up.

Both of those calculations are for a manual trans. If you have an auto, you are on your own with that one. It takes an auto guru to set it u correctly then, because with the different gears creating different shift points in the trans.

But back to installing gears (ring and pinion), it is better left to a professional. All it takes is being off by .005 of an inch and you will destroy the new gears that you have installed. And by the questions that you asked in your original post, you aren't the guy to be installing gears on your own.
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Old 03-08-2014, 10:56 PM   #6
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I have a 2.5, Line 4
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Old 03-08-2014, 10:58 PM   #7
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Quote:
Originally Posted by 0III0forlife View Post
To answer your question, ring and pinion are the only things that you have to change, if you have a 4cyl. The 2.5L has 4.10 gears stock, and needs to have 4.88's in order to turn 33" tires effectively. Now if you have a 6cyl the stock ratio is 3.07, and then you will need a new carrier in the axle along with 4.10 gears. The carrier break is 3.53 and down, and 3.73 and up. Both of those calculations are for a manual trans. If you have an auto, you are on your own with that one. It takes an auto guru to set it u correctly then, because with the different gears creating different shift points in the trans. But back to installing gears (ring and pinion), it is better left to a professional. All it takes is being off by .005 of an inch and you will destroy the new gears that you have installed. And by the questions that you asked in your original post, you aren't the guy to be installing gears on your own.
Yea haha, i definitely wouldn't do it myself .. I'm just curious
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Old 03-09-2014, 01:26 PM   #8
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I have an (automatic) 88 with 33"s and suspension/body and stock axel and diff. No probs....so far. Been running it for 2+yrs now. Highway at 60-65mph. looking to go to 35"s which would require me to go to new ring/pinion and doing a rear end swap for a Ford 8.8. Possibilites are endless for these.

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