Modified XJ Cherokee Tech XJ (84-01)
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Vibes - Still

Old 05-08-2019, 09:32 PM
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Year: 1991
Model: Cherokee(XJ)
Engine: 4.0L L6 OHV 12V
Default Vibes - Still

Starting point: 1991 XJ. 4.0, 4WD, 5 speed AX15. 1996 Dana 30. 1987 Dana 44. Geared to 3.55. NP231 t-case. 3 Inch lift front and rear.

All was OK. No vibes.

Installed a reman t-Case and a Tom Wood's drive shaft.

Vibes VERY BAD @ 45 mph +. Didn't subside no matter the speed.

Re-geared to 4.10 (Thanks to two exceptional people. Super friendly, down to Earth. The technician is a mastermind that Dana should be very thankful for.).

Same, bad vibes @ 45 mph +.

Removed rear propeller shaft.

Smooth as silk.

Installed front propeller shaft in the rear.

Same vibes.

1" Transfer case drop.

Same.

Back to the OEM cross member and 4 degree shims.

Same.

7 Degree shims (don't ask. My father's son was stupid).

Same.

3 Degree shims.

Same.

What must be one of the world's worst 4 X 4 shops fixed their screw up. They didn't tighten down the axle retainer on the rear passenger side drive shaft. Leaking fluid on the tire. New bearing and seal.

Same.

New tires and wheels.

Same.

Swapped the yoke on the slip yoke kit.

Same.

Found that the transmission mount was cracked. Installed Stinky Fab transmission mount.

Worse. Very bad vibes at 35 mph +. Did not subside at higher speeds.

Once again, removed rear drive shaft.

Once again, smooth as glass.

Flipped rear propeller shaft 180 degrees (NO, not front to back, its a double cardigan, not possible [well I guess somebody could accomplish the feat, rotated it).

Vibes 80% less. No lie. Not my imagination.

Current state. 1 Degree shim. Brand new Tom Wood's drive shaft.

Vibes slightly less.

Throughout this whole thing, when coasting to a stop, with clutch disengaged (clutch pedal to the floor) from 35 MPH +, vibes like crazy until I hit 2 MPH.

I have a .45 side arm, a 12 gauge pump, 12 gauge OU that will accept 3 1/2" shells, a bow, and a 22 magnum. I think I would pick the 22 magnum. The pain of being tagged by that about 10 times would feel the same as this situation, but I would be done and wouldn't have to worry about the damn XJ anymore
I guess I am down to asking for a new t-case???

PLEASE ADVISE, or just volunteer to finish me off with the 22, please.

Last edited by Rlmx; 05-09-2019 at 07:07 AM.
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Old 05-11-2019, 05:17 AM
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I would check the rear output yoke for play. There is a bearing inside of the sye housing

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Old 05-19-2019, 07:06 AM
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Originally Posted by Rlmx View Post
Starting point: 1991 XJ. 4.0, 4WD, 5 speed AX15. 1996 Dana 30. 1987 Dana 44. Geared to 3.55. NP231 t-case. 3 Inch lift front and rear.

All was OK. No vibes. Installed a reman t-Case and a Tom Wood's drive shaft. Vibes VERY BAD @ 45 mph +. Didn't subside no matter the speed...
Totally by happen-chance, it is not the diff angle or anything to do with it.

Ugggghhh



Output shaft on the AX 15 is wobbling. Transmission has failed.

Time to seek out recommendations on acquiring an AX 15.

Hats off to any of you folks that have restored one of these vehicles. You have my respect. Not for the faint of heard, or weak in resolve.
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Old 05-19-2019, 02:43 PM
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Tough luck man, Advance adapters and novak both sell AX15s, brand new, for not an outrageous price IMO.
https://www.advanceadapters.com/prod...nsmission-new/
https://www.novak-adapt.com/catalog/...s/ax15-package
Mind you, they are intended for Tj's meaning different mounting angle for the t case, but that's fixable
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