msvance
11-06-2004, 06:53 PM
this is also posted over on NAGCA but I need as much exposure and help as possible. Thanks in advanced!!
OK, here's the problem - Rear end (Al44) vibration & grinding noise (most noticeable at very very low speed during acc. and dec.), significant "wobble" (edit - in/out, not sure about up/down) on passenger side rear tire. No wobble noticed on drivers side. you can actually see the caliper move in/out.
What I've done -
1. before i noticed the wheel wobble, i adjusted rear pinion angle to spec.
2. after I noticed wheel wobble, I removed wheel & brakes to focus on axle shaft itself - the axle shaft itself wobbles (this eliminated warped rotor, although I do know they are shot). I replaced wheel bearings and carrier bearings. (i also welded the carrier while i was in there)
3. installed axle shafts and still wobble on passenger side and still noises, vibration, etc. on short test drive.
4. ordered new axle shaft thinking it was bent, installed and still wobble. I have not taken it for a drive yet. I have put the vehicle in drive with the rear cover off and not sure if I really notice any wobble of the carrier or not, but I may. Not sure if it is optical illusion or not??
5. I looked at the places where the axle tubes are pressed in to the centersection and there is no sign of fatigue, broken plug welds, stress fractures or anything. If the axle itself was bent or warpped I thought i would notice something there.
Now - what do i do? Thoughts??
Now, to take the story back a little further, I was wheelin' ~6 mo. ago and ripped the upper drivers side rear control arm frame mount off. I patched it up to get home and then built longarms for the rear and installed claytons sub-frame (kept front SA's). I drove for the last ~6mo. like that, and just now put the ZJ in the garage and swapped in a new front axle (hp44, lock-right, 4.10 like the rear), swapped the front 3.5" tera springs to the rear and added 4.5" rubicon exp. springs up front on top of the radius arms which provide ~2" so I netted a lift of ~6.5". In the rear, the only thing I did was adjust the control arms for the proper pinion angle. I also added wheel spacers to the rear which I think made the problem more noticeable than before. Before the recent mods, I had issues, but did not seem as drastic as now. i also blamed part of the issues on the fact that when I installed the longarms I got the pinion angle close, but never fine tuned it because i was planning on swapping in the new axle, supension, etc. Plus, I didn't drive the ZJ a whole lot during that time because it was the same time I bought the Avalanche.
Anyhow, that as much detail as I can give. The only other thing I could think of was a warped housing, but I am not sure how to measure that and like I said, there are no indications of such where the tubes press in to the center section. I'm also irate, becuase I spent money on this thing (bearings and new shaft) which I swore I wouldn't do because I have full intentions of a ford 9"!
HELP!!
OK, here's the problem - Rear end (Al44) vibration & grinding noise (most noticeable at very very low speed during acc. and dec.), significant "wobble" (edit - in/out, not sure about up/down) on passenger side rear tire. No wobble noticed on drivers side. you can actually see the caliper move in/out.
What I've done -
1. before i noticed the wheel wobble, i adjusted rear pinion angle to spec.
2. after I noticed wheel wobble, I removed wheel & brakes to focus on axle shaft itself - the axle shaft itself wobbles (this eliminated warped rotor, although I do know they are shot). I replaced wheel bearings and carrier bearings. (i also welded the carrier while i was in there)
3. installed axle shafts and still wobble on passenger side and still noises, vibration, etc. on short test drive.
4. ordered new axle shaft thinking it was bent, installed and still wobble. I have not taken it for a drive yet. I have put the vehicle in drive with the rear cover off and not sure if I really notice any wobble of the carrier or not, but I may. Not sure if it is optical illusion or not??
5. I looked at the places where the axle tubes are pressed in to the centersection and there is no sign of fatigue, broken plug welds, stress fractures or anything. If the axle itself was bent or warpped I thought i would notice something there.
Now - what do i do? Thoughts??
Now, to take the story back a little further, I was wheelin' ~6 mo. ago and ripped the upper drivers side rear control arm frame mount off. I patched it up to get home and then built longarms for the rear and installed claytons sub-frame (kept front SA's). I drove for the last ~6mo. like that, and just now put the ZJ in the garage and swapped in a new front axle (hp44, lock-right, 4.10 like the rear), swapped the front 3.5" tera springs to the rear and added 4.5" rubicon exp. springs up front on top of the radius arms which provide ~2" so I netted a lift of ~6.5". In the rear, the only thing I did was adjust the control arms for the proper pinion angle. I also added wheel spacers to the rear which I think made the problem more noticeable than before. Before the recent mods, I had issues, but did not seem as drastic as now. i also blamed part of the issues on the fact that when I installed the longarms I got the pinion angle close, but never fine tuned it because i was planning on swapping in the new axle, supension, etc. Plus, I didn't drive the ZJ a whole lot during that time because it was the same time I bought the Avalanche.
Anyhow, that as much detail as I can give. The only other thing I could think of was a warped housing, but I am not sure how to measure that and like I said, there are no indications of such where the tubes press in to the center section. I'm also irate, becuase I spent money on this thing (bearings and new shaft) which I swore I wouldn't do because I have full intentions of a ford 9"!
HELP!!