Ok, long story, I will try to keep it short.
I had my 3 ujoints replaced in early March. Only the rear one was bad, but at 175,000 then, I figured just change them out. Done, Bad vibration at about 35 mph. The fix was, that the guy who did the swap put the 2 driveshafts together 180 degrees off. So I got that fixed at my dealer, they checked the shafts for balance, everything was assembled and life was good.
2 weeks later on a trip to NC, I got a wif of what I thought was rear end grease, but it was that the TCase seal had come out of the TCase and was spraying a little fluid out as I drove down the road. Went to a dealer in Ashville NC and they said the Carrier was bad, and it was, replaced that, balanced shafts again to make sure all was well, and replaced T Case seal.
Life was good and no vibration. a few weeks later, I started to feel a small shudder on launch. It did not matter what I did, WOT or easy, still there. in 4wd, or 2wd, still there. over the summer it just got a little more pronounced and I finally got fed up and took back to dealer. They looked and checked things out and found the carrier rubber was torn all the way around it, and swapped the carrier out as it was under warranty from the NC dealer install. I was out the door and no vibration.... for about 500 miles, then the vibration came back.
So I did some research and found that most people that see this type of vibration just dropped the carrier down some to compensate for a changed angle on the pinion. Well, that does not solve the problem as to why it is doing it in the first place. For 5 years the truck was smooth as silk, then just develops a vibration??? I dont think so, something else is wrong and hard to track down.
One last experiment by me was that I loaded up 500lbs of sand in the bed, and drove around 500 miles of vibration free ride, but low and behold it started back up again and it was worse than ever. Right now we are throwing things at it. I am changing tires tomorrow, but do not see how it could be tires as the vibration is from about 3mph to about 20mph then it smooths out and undetectable.
We are pulling the diff cover off tomorrow to see if something in there is bad, but, at one point I jacked up the rear end and put the axle on jackstands and let the wheels spin with no load, and the vebration was still there at those speeds, so with no load on tires and no load on rear diff as both tires off the ground and the truck at nearly level road height, it was still there, so it also eliminates axle wrap as the culprit too.
I also suspect that my original vibration from the out of clock driveshaft could have bent the Slip yoke some, and dont have one loacally to put in a check that. All ujoints double checked, but I am not above putting 3 more on it to see.
Any ideas? I am not dropping the carrier as it was not needed to do that for 175,000 miles and I will not start it today.
Motor mounts? Tranny Mounts?
I had my 3 ujoints replaced in early March. Only the rear one was bad, but at 175,000 then, I figured just change them out. Done, Bad vibration at about 35 mph. The fix was, that the guy who did the swap put the 2 driveshafts together 180 degrees off. So I got that fixed at my dealer, they checked the shafts for balance, everything was assembled and life was good.
2 weeks later on a trip to NC, I got a wif of what I thought was rear end grease, but it was that the TCase seal had come out of the TCase and was spraying a little fluid out as I drove down the road. Went to a dealer in Ashville NC and they said the Carrier was bad, and it was, replaced that, balanced shafts again to make sure all was well, and replaced T Case seal.
Life was good and no vibration. a few weeks later, I started to feel a small shudder on launch. It did not matter what I did, WOT or easy, still there. in 4wd, or 2wd, still there. over the summer it just got a little more pronounced and I finally got fed up and took back to dealer. They looked and checked things out and found the carrier rubber was torn all the way around it, and swapped the carrier out as it was under warranty from the NC dealer install. I was out the door and no vibration.... for about 500 miles, then the vibration came back.
So I did some research and found that most people that see this type of vibration just dropped the carrier down some to compensate for a changed angle on the pinion. Well, that does not solve the problem as to why it is doing it in the first place. For 5 years the truck was smooth as silk, then just develops a vibration??? I dont think so, something else is wrong and hard to track down.
One last experiment by me was that I loaded up 500lbs of sand in the bed, and drove around 500 miles of vibration free ride, but low and behold it started back up again and it was worse than ever. Right now we are throwing things at it. I am changing tires tomorrow, but do not see how it could be tires as the vibration is from about 3mph to about 20mph then it smooths out and undetectable.
We are pulling the diff cover off tomorrow to see if something in there is bad, but, at one point I jacked up the rear end and put the axle on jackstands and let the wheels spin with no load, and the vebration was still there at those speeds, so with no load on tires and no load on rear diff as both tires off the ground and the truck at nearly level road height, it was still there, so it also eliminates axle wrap as the culprit too.
I also suspect that my original vibration from the out of clock driveshaft could have bent the Slip yoke some, and dont have one loacally to put in a check that. All ujoints double checked, but I am not above putting 3 more on it to see.
Any ideas? I am not dropping the carrier as it was not needed to do that for 175,000 miles and I will not start it today.
Motor mounts? Tranny Mounts?
