Out of curiosity, different gears front and rear? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 8 Old 03-12-2009, 07:08 PM Thread Starter
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Out of curiosity, different gears front and rear?

Knowing less than nothing about this, I wanted to know if it is inadvisable to run different gears front and rear and why (or why not)?

Teach me, Obi Wan!

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post #2 of 8 Old 03-12-2009, 07:11 PM
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It's not possible. The tires spin at the same speed while you are driving, so the gears must have the same ratio front and rear.

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post #3 of 8 Old 03-12-2009, 07:39 PM Thread Starter
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I suppose if I had stopped to think about it I would have realized that even in 2-wheel drive the front diff is spinning....

I am not used to thinking about having gears in front.

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post #4 of 8 Old 03-12-2009, 08:12 PM
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yes, it's possible. as long as tire size and gearing match

like on my 4wd tractor, the front end is geared differently than the rear end because the front tires are half the size of the rear tires

on the jeep, having the front a different gear than the rear in 2wd wouldn't matter since they're disconnected at the t-case. The driveshafts would be turning at different speeds is all that would occur. When you put that in 4wd, then it would become an issue if the tires were the same on all 4 corners
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post #5 of 8 Old 03-13-2009, 09:53 PM
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Starting tommorrow Ill be running 5.13's in the rear and 3.21's in the front for 2 weeks. I just couldnt afford to do them both at the same time. Its possible but you cant put it in 4wd untill the gears are the same size front and rear.
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post #6 of 8 Old 03-14-2009, 06:51 PM
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Quote:
Originally Posted by s10x1000 View Post
Starting tommorrow Ill be running 5.13's in the rear and 3.21's in the front for 2 weeks. I just couldnt afford to do them both at the same time. Its possible but you cant put it in 4wd untill the gears are the same size front and rear.
Do you already have large tires? Just curious, cause if not you could have saved a few mpg's doing the fronts first.

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post #7 of 8 Old 03-15-2009, 08:37 AM
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Quote:
Originally Posted by Preacher View Post
I suppose if I had stopped to think about it I would have realized that even in 2-wheel drive the front diff is spinning....
But the front driveshaft at the t-case is not engaged in 2WD. Obviously you wouldn't want to keep it like that as you'd only have a 2wd Jeep, but you can drive it like that on the highway in 2wd no problem.
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post #8 of 8 Old 03-15-2009, 04:33 PM
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Quote:
Originally Posted by Nanook View Post
Do you already have large tires? Just curious, cause if not you could have saved a few mpg's doing the fronts first.

I got it back today but something went wrong with the install so Ill haveto take it back tommorrow.
Ive got 35's thats why I went with the rear first to at least get my mpg up a little.
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