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Driveshaft & pinion angle questions

Old 02-11-2019, 05:28 PM
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Default Driveshaft & pinion angle questions

So I installed a hack and tap and after measuring multiple times I still feel as though I mucked it up. My center of ujoint to ujoint measurement is roughly 33”. Is my driveshaft extended too far? (Stock xj front shaft from a 92 4.0 auto).

Also so I now have vibration most notable from 25 to 35 mph. How do I go about measuring for correct shims and will I need new leaf spring pins?

ive researched and researched and have only confused myself. Any help would be appreciated.

Oh, 1992 4.0 aw4 C8.25 with roughly 4.5 lift in the rear soon to be slightly more one I install shackle relocation brackets to alleviate bad shackle angle and try to get closer to 5-5.5 to match the front.

Thanks in advance.
Mark



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Old 02-11-2019, 07:54 PM
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You will for sure need to install some pinion angle shims looking at the rear pinion! at least 4 deg. maybe 6 you want your pinion in line with the rear drive shaft as close to a straight line as pos. That is what's causing the vibration for sure the output shaft looks like you did a great job! I would correct the pinion angle first and go from there a for sure problem!



Last edited by RockinRonnie; 02-11-2019 at 07:59 PM.
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Old 02-12-2019, 06:24 PM
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Originally Posted by RockinRonnie View Post
You will for sure need to install some pinion angle shims looking at the rear pinion! at least 4 deg. maybe 6 you want your pinion in line with the rear drive shaft as close to a straight line as pos. That is what's causing the vibration for sure the output shaft looks like you did a great job! I would correct the pinion angle first and go from there a for sure problem!


thanks ronnie. I won’t lie I was pretty nervous about cutting that output shaft.

All of that hat being said I have some angle measurements, hopefully someone can help out as again as I researched this I only confused myself.

Output shaft (best eyeball measurement I could get without taking off the driveshaft) 5*.
Driveshaft measurement 18*.
Pinion measurement (again best eyeball off the shaft and flat sections of the diff housing) 5*.

Am I right to think that 6* shims puts me within 1*?

Anyone? Lol
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Old 02-12-2019, 08:49 PM
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I would think your real close! 6 deg. shim!
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