BAD Driveline vibrations Help!

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Jul 5, 2009 | 05:19 PM

#31

mike37

CF Veteran

Joined: Nov 2008

Posts: 2,473

Likes: 9

From: Paso Robles Ca

Year: 1991

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by yellow97XJ

just put the driveshaft in place and it looks like the pinion angle is too far up. it did have 4degree shims in it which would make it even higher. i bought a cheap angle finder tool and it says the driveshaft is atound 11-12degrees but there isnt much of a flat area on the pinion part to get a real accurate reading, i got somthing between 15-20degrees. and with the old wedges it would be higher. i dont know if somthing could of shifted the whole axel? arent people usually having problems with too low of a pinion angle? should i put the wedge in backwards? ill try to get some pics up, cant do it on this computer.

oh and i noticed the pinion yolk is shot from the u-joint caps spinning(i think the hold down caps got bent from knocking the driveshaft off one too many times)

i have a 97' 8.25 rear what years can i pull a junkyard yolk from?

if anyone would like me to get a specific picture just let me know

use the angle finder on the back of the axle use two of the cover plate bolts o set it against

Jul 5, 2009 | 05:22 PM

#32

4.3L XJ

CF Veteran

Joined: Aug 2008

Posts: 6,588

Likes: 495

From: Chico, CA

Year: 1986

Model: Cherokee

Engine: 4.3L with headers and full 3" exhaust system

Quote:

Originally Posted by mike37

use the angle finder on the back of the axle use two of the cover plate bolts o set it against

That is what I have been saying. Do this instead of just throwing shims at it.

Jul 5, 2009 | 05:46 PM

#33

yellow97XJ

Thread Starter

Seasoned Member

Joined: Apr 2009

Posts: 288

Likes: 0

From: Northeast PA

Year: 1997

Model: Cherokee

Engine: 4.0, k&n intake Flomaster cat back

yea, if the angle is too high can you put the shims in backwards or is somthing most likely broken?

Jul 5, 2009 | 06:24 PM

#34

mike37

CF Veteran

Joined: Nov 2008

Posts: 2,473

Likes: 9

From: Paso Robles Ca

Year: 1991

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by yellow97XJ

yea, if the angle is too high can you put the shims in backwards or is somthing most likely broken?

sound to me like you had a bad ds angle to start with now you have a bad yok that needs to be replaced

yes you can revers the shims if that gives you the right angle on the pinion

Jul 5, 2009 | 07:01 PM

#35

yellow97XJ

Thread Starter

Seasoned Member

Joined: Apr 2009

Posts: 288

Likes: 0

From: Northeast PA

Year: 1997

Model: Cherokee

Engine: 4.0, k&n intake Flomaster cat back

yea i have to get another yolk and go from there and try and get the angle right

Jul 5, 2009 | 07:23 PM

#36

muddeprived

CF Veteran

Joined: Oct 2007

Posts: 3,883

Likes: 6

From: W-PA

Year: 2001

Model: Cherokee

Engine: 4.0

Use the cap of the u-joint to check pinion angle as shown in the stu-olsen link. I couldn't trust the cover bolts because sometimes they aren't exactly even. It would be better to take off the cover and put it on the mating surface of the axle.