400Rogue
Newbie
Hi all! Happy Friday. I'm chasing a vibration/drone in what feels like the rear at 50mph. As speed increases above this the resonance frequency does as well and is less noticeable. 96 k1500 Z71 with a 5.3 swap. Original 4L60. 10 bolt rear end. The entire front suspension (except shocks) has been redone. All bushings, ball joints, tie rods, etc. The moment I drop under about 48 MPH it goes away.
Dial indicator on the drive shaft shows 0.022" of run-out. This doesn't seem that excessive to me and the weights are all still there. There is no center support bearing.
I also checked run-out of both axle flanges as well. Neither are bad. Surprisingly good actually with maybe .005". There is some wear on the axle bearing surfaces which I believe to be the cause. One axle has 0 radial play. The drivers axle has .010" of radial play (up and down). This seems like a lot to me considering the passenger has 0. Wheel bearings are pretty new and I will say the passenger side did not want to easily slide in place when the wheel bearings were replaced. It needed some gentle tapping with a dead blow. No turning resistance when installed. My guess is the damage on the axle surfaces are the culprit here but could use a sanity check.
I have a PDF of the factory service manual but I don't believe it to be complete. I cannot find anywhere the specifications for radial play. Does anyone have this information? I did a quick search on here but wasn't able to find what I was looking for. I have not had the drums tested for balance but I am not convinced they are the source of the issue.
Dial indicator on the drive shaft shows 0.022" of run-out. This doesn't seem that excessive to me and the weights are all still there. There is no center support bearing.
I also checked run-out of both axle flanges as well. Neither are bad. Surprisingly good actually with maybe .005". There is some wear on the axle bearing surfaces which I believe to be the cause. One axle has 0 radial play. The drivers axle has .010" of radial play (up and down). This seems like a lot to me considering the passenger has 0. Wheel bearings are pretty new and I will say the passenger side did not want to easily slide in place when the wheel bearings were replaced. It needed some gentle tapping with a dead blow. No turning resistance when installed. My guess is the damage on the axle surfaces are the culprit here but could use a sanity check.
I have a PDF of the factory service manual but I don't believe it to be complete. I cannot find anywhere the specifications for radial play. Does anyone have this information? I did a quick search on here but wasn't able to find what I was looking for. I have not had the drums tested for balance but I am not convinced they are the source of the issue.