Drive train vibration. Bumming me out.
#1
Drive train vibration. Bumming me out.
I,m getting what I feel determined as a bad driveshaft vibration, but I'm getting a bit stumped. I believe I had narrowed it down to a bad front driveshaft by removing the shafts individually.
A short history. New tires and a few days into it I noticed a vibration. Rebuilt the rear shaft and afterwards noticed that it seemed a weight had rusted off. Ordered a new shaft (figured I would have the old one re-balanced and save as spare). Also ordered a new front shaft. Installed both and vibration was still there and seemed to get worse. I was concerned with the new front one as it was a cheaper Ebay and it had too many weights on it for my liking.
OK, so having both new shafts still installed I removed the rear and test drove. Was way worse as far as acceleration vibration. I then re-installed the rear and removed the front. No vibration. I then re-installed my OLD front shaft that I then noticed a weight was missing on that. Thought maybe this was my issue to begin with. Yes, I taped a couple of washers on this shaft where I saw the weights were missing. Installed it, test drove and little to no vibration at all. Concluded I got a crap front shaft from eBay. Ordered a new one from Lucky 8, .. the $208 one. Yesterday with still my old front shaft on I really started feeling that vibration under power again, the one we all feel is a bad shaft. It was getting pretty bad. In the afternoon I threw on the new Lucky 8 shaft and test drove. Felt as bad, or maybe a touch worse. So, WTF? Is it possible I got another bad shaft, or do I have issues I don't understand?
Thoughts? Discussion?
Thanks
PS. So the vibration happens under acceleration starting around 45 to 50. Throw it in neutral and its as smooth as silk.
A short history. New tires and a few days into it I noticed a vibration. Rebuilt the rear shaft and afterwards noticed that it seemed a weight had rusted off. Ordered a new shaft (figured I would have the old one re-balanced and save as spare). Also ordered a new front shaft. Installed both and vibration was still there and seemed to get worse. I was concerned with the new front one as it was a cheaper Ebay and it had too many weights on it for my liking.
OK, so having both new shafts still installed I removed the rear and test drove. Was way worse as far as acceleration vibration. I then re-installed the rear and removed the front. No vibration. I then re-installed my OLD front shaft that I then noticed a weight was missing on that. Thought maybe this was my issue to begin with. Yes, I taped a couple of washers on this shaft where I saw the weights were missing. Installed it, test drove and little to no vibration at all. Concluded I got a crap front shaft from eBay. Ordered a new one from Lucky 8, .. the $208 one. Yesterday with still my old front shaft on I really started feeling that vibration under power again, the one we all feel is a bad shaft. It was getting pretty bad. In the afternoon I threw on the new Lucky 8 shaft and test drove. Felt as bad, or maybe a touch worse. So, WTF? Is it possible I got another bad shaft, or do I have issues I don't understand?
Thoughts? Discussion?
Thanks
PS. So the vibration happens under acceleration starting around 45 to 50. Throw it in neutral and its as smooth as silk.
Last edited by Greg Vasileff; 12-25-2017 at 09:39 AM.
#2
So you had no vibration until installed new tire's,?
But then again no vibration without front shaft,?
Both new shafts can't be bad, (even though possible),,,
I would guess a bad front output flange on transfer case perhaps, take front shaft off & check T-case flange for excessive looseness (side to side), could be a bad bearing causing vibration under pressure,
But then again no vibration without front shaft,?
Both new shafts can't be bad, (even though possible),,,
I would guess a bad front output flange on transfer case perhaps, take front shaft off & check T-case flange for excessive looseness (side to side), could be a bad bearing causing vibration under pressure,
#3
This D2 is new to me. Only a few months. The tires on it were pretty chopped so I dont think I could feel the drivetrain vibration. I'm pretty sensitive to driveline vibration. New tires on and I felt it. Felt like it grew worse. I didn't like the new tires so got new BFGs. So, not that it was suggested, but tires are not the issue, though I think I have a bad wheel, maybe two.
Anyway, I did all I could to see if any of the yokes had play, side to side, in and out and they all 'seem' rock solid.
Anyway, I did all I could to see if any of the yokes had play, side to side, in and out and they all 'seem' rock solid.
Last edited by Greg Vasileff; 12-25-2017 at 10:57 AM.
#4
Did you fully grease/lube the U joints before you installed the new shafts? And yes I know they come "pre-greased" but that doesn't matter. Some will not take a full grease even on the bench.
It's B$ and lazy, but you would be amazed at how tight they slam those bearing caps in. And they look like the U joints are moving until under load, then not so much.
Also check if the zerks are phased proper, like
#6
#7
Hey Brian,
Yes, I put in new +2 TF springs and shocks, but did not change the lift as to what was in there. (By the way, I haven't forgotten about you). This vibration is for certain a drivetrain vibration and not an alignment issue. I found a driveshaft shop about an hour away that I believe can re-balance one of my now three driveshafts. Think it's worth it to start there to get "balancing" off the table as the issue or not.
Yes, I put in new +2 TF springs and shocks, but did not change the lift as to what was in there. (By the way, I haven't forgotten about you). This vibration is for certain a drivetrain vibration and not an alignment issue. I found a driveshaft shop about an hour away that I believe can re-balance one of my now three driveshafts. Think it's worth it to start there to get "balancing" off the table as the issue or not.
#8
#9
#10
Drove a but today. I can start to feel this driveline vibration at 30 mph. Only when under acceleration. To me it really feels like a bad U joint, but I find this unlikely as all are new on all the shafts. When I let off the gas the vibration goes away, yet I'm not getting that typical vibration when you let off the gas hard that you get with a bad U joint. I would think that if it was an un-balanced shaft that the vibration would remain when coasting. When I coast, all is smooth a silk.
Driveshaft shop was closed today.
By the way, my wheels are not hubcentric. In reading I hear many don't see it necessary on vehicles like these. That can be another topic.
Driveshaft shop was closed today.
By the way, my wheels are not hubcentric. In reading I hear many don't see it necessary on vehicles like these. That can be another topic.