Pulsating driveline vibes from 60mph and up, increases in frequency with increased speed.
Have tried 2° up to 2° down pinion angle, in 0.5° increments - no change whatsoever in vibes.
Have two rear driveshafts - a heavy weight shaft, which produces the worst vibes and a lighter weight shaft that produces less vibes. Both balanced multiple times & rebuilt by pro shops.
Remove rear driveshaft & drive on front = no vibes
Run the Jeep up to 75mph in 2wd with driveshaft removed = no vibes
Update to this:
Vibes are still prevalent, probably got over 30k miles on it like this.
Replaced the trans mount - no change.
Took Jeep to drivetrain specialist shop to have them diagnose & fix the vibration.
They were able to recreate the vibes on the lift...
Checked driveshaft balance, and that was fine. that's the 3rd place to verify driveshaft balance.
They ran it with a different pinion in the housing, with the driveshaft connected and the ring gear & carrier removed - still vibes.
Changed pinion yoke - still vibes
Checked runout of gears & yoke - well within spec.
While disassembled they checked the gear setup, preload and all bearings. All is good.
Bottom line, they couldn't find any reason for vibes...
So, no change...
Big props to Western Drivetrain - I would highly recommend them for anyone in the Denver area.