3.55 vs 3.73 rear end

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08-21-2013, 02:23 PM

#16

Zack92MJ

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Year: 1992

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Quote:

Originally Posted by Kris smith

Go big or go home ! I'm going from 307-410

X2. But it's true that XJs are under geared from the start*

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08-21-2013, 02:38 PM

#17

Gary Briggs

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Year: 1996

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I picked up a 8.8 with disc brakes and a LSD with 3.73. I'm going to install it the way it is, see how I like it coming from the 3.07, then determine if 4.10's are necessary. I seem to get around just fine with the stock gears, 31's and the 5 speed. I'm always in low range on the trail so the only time I'm hating the gears is when I pull my boat. I'm hoping the 3.73 will do the trick!

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08-21-2013, 03:26 PM

#18

s14unimog

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Are we just assuming its an automatic? What about tire sizes? Increasing the ratio will not help mileage unless its currently under geared due to over sized tires.

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08-21-2013, 09:12 PM

#19

Zack92MJ

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Year: 1992

Model: Comanche

Engine: 4.0

Quote:

Originally Posted by s14unimog

Are we just assuming its an automatic? What about tire sizes? Increasing the ratio will not help mileage unless its currently under geared due to over sized tires.

He's got 3.55 now. Autos have 3.55 and manuals have 3.07. So everyone's assuming it's an auto

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08-22-2013, 12:01 AM

#20

evan00xj

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Quote:

Originally Posted by ct67_72

Xj's are undergeared from the factory anyway. I say if you are going to regear, match the factory final drive and fire size, then add .5 revolutions. So if you went to a 31-32, the oem equivalent gear should be 4.10, but 4.56 would be much better. So on a stock tire size, from 3.54 I would go 4.10. Etc.

Yup. I'm a happy camper with 4.10s and 32's

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08-22-2013, 11:34 AM

#21

s14unimog

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Quote:

Originally Posted by Zacks98

He's got 3.55 now. Autos have 3.55 and manuals have 3.07. So everyone's assuming it's an auto

True. So we're giving recommendations based on assumptions now? Still no word on his tire size either... Just sayin.

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08-22-2013, 12:58 PM

#22

mentalbreakdown00

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I went from a 3.07 and stock with a stick shift to 3.55's and 32's and it still feels like it did stock..

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08-22-2013, 08:09 PM

#23

jburr94xj

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Quote:

Originally Posted by Gary Briggs

Do you have front 3.73 gears already. The PO swapped a new axle under my jeep from a tow package and I have a 3.73 ring pinion. And carrier. I have a 5 speed and will be putting 3.07 back in it so I can enjoy 4x4 capabilities