Driveline Vibration between 40-65mph?

[alpinewhite318i]

I have a bad driveline vibration between 40-65mph in gear and neutral when on the highway. Could it be the Guibo or Center Bearing?

[RobE30]

^Me too. After posting this here and BF.c, seems like the issue lies w/ the rear u-joint. Mine vibrates the worst in 4th gear, but sounds like we have the same issue.

[alpinewhite318i]

I have a rebuilt driveshaft that was actually rebalanced. Maybe it is just a bad driveshaft! Is your newer or original?

[RobE30]

As far as I know its the OE 187k driveshaft.... I haven't gotten around to getting mine rebuilt

[Brandon12V]

dude, im getting the same crap! I had my driveshaft rebuilt at Rack&Axle with a new guibo pressed on, new u-joints, carrier bearing. Replaced the open diff for a 3.73LSD. Replaced ALL mounts for solid ones and the vibration is still there!! WTF?!

[Bimmer335is]

I've been having the same problem as all you guys, I did the exact same stuff Brandon did... and have now gone through 2 guibos, and 1 half shaft. maybe I need a new diff.