Will 3.08 internals work with a 3.07? - JeepForum.com
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Unread 07-26-2012, 05:15 PM   #1
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2003 TJ Wrangler 
Join Date: Mar 2007
Location: MD
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Will 3.08 internals work with a 3.07?

Screwed up my internals in my rear and picked up an older d35 with 3.08 from an xj.

Basically wondering if I can transfer the internals (carrier, ring gear, etc) from the xj d35 3.08 into my d35 3.07. And how hard is this to do correctly?

My Jeep has been sitting for a month now and I'm tried of not being able to go anywhere while the wife is working.

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Unread 07-26-2012, 07:12 PM   #2
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2006 LJ Wrangler 
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I would assume a d35 is a d35, so they should fit. As for the slight difference in ratios, I know some Jeeps shipped with a 4.11 front and 4.10 rear (or was it the other way around? Someone will undoubtedly correct me). As for how easy it is to swap, it's not. Basically, you're doing a regear. You can't just swap the shims over (or reuse the originals) and hope it works. You have to go through the whole process. Doable, but not for the meek.
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Unread 07-26-2012, 09:29 PM   #3
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2003 WJ 
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Umm not sure, but I would just keep searching for a used D35 from a TJ with 3.07's. Seems alot easier, they're all over the place during summer. Good luck.
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Unread 07-26-2012, 10:56 PM   #4
Jerry Bransford
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2004 TJ Wrangler 
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Location: Escondido, California, California
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For all TJs with the exception of the Rubicon which has the same axle front and rear, there is a .01 ratio difference between the front and rear due to the difference in f/r ring gear sizes. So Jeeps come with these combinations of f/r ratios... 3.07/3.08, 3.54/3.55, 3.73/3.74, 4.10/4.11.

The .01 ratio difference is ok due to our 4x4 system being designed for loose low-traction road surfaces. Even if they were exactly the same however, you still couldn't drive in 4x4 on the street since the front axle turns faster than the rear axle does on curves and turns. Offroad, it's a non-issue.
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