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Old 10-11-2008, 10:31 PM   #1
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TJ Dffs on a YJ frame

OK TJ guys...I have a question or two for you. I have a 87 YJ. I recently aquired a complete set front and rear DIffs from a 98 TJ(unlifted, trackbars, springs, control arms, etc.) I also have a 99 TJ frame though slightly bent from which to rob all the appropriate bracketry.. My questions are these...Has anyone ever put TJ diffs under a YJ? I want to use my YJ frame to eliminate completely dismantling the entire rig. I plan on removing the control arm brackets from the donor frame and grafting them to my yj. Anyone have any suggestions or concerns? Am I insane? How cool would it be to have the YJ in my parts with coils? Any offers of assistance or advise would be greatly appreciated.

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Old 10-11-2008, 10:34 PM   #2
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You mean you have the axles from a TJ with the CAs, TBs, springs, ... ?
Than you´re talking about a coil sping conversion on a YJ?

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Old 10-11-2008, 10:37 PM   #3
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right... but with factory parts versus a 1500.00 kit
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Old 10-11-2008, 10:59 PM   #4
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do it
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Old 10-11-2008, 11:11 PM   #5
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IMO you need a different driveshaft in the front. the YJ D30 has a high pinion and the YJ D30 a low pinion.


Which engine/tranny/gears do you have in your YJ? The TJs often came with lower gears. That will make your YJ a bit sluggish.
p.e my old 4.0L YJ with 5spd manual tranny came with 3.73 gears, my old TJ with the same setup came with 3.07 gears.
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Old 10-12-2008, 02:47 AM   #6
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What axles does the tj have? Is it really worth it even messing with replacing something that is the exact same strength?
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Old 10-12-2008, 08:13 PM   #7
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The TJ has D30/D35, but lower gearing and I plan on upgrading later. I just want the smoother more flexible coils underneath. I will be going from 3.07 to 3.73 gearing. I have a 258 ci and an ax-15. As far a strength, for now I am light on the go pedal and don't wheel very hard. I am setting myself up for the D44 Rubicon swaps down the road. I wheel with a lot of TJs and want the flexibility, but like the YJ styling. I am just a sucker for something different.

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