Car is the 740 in my sig. I recently replaced the u-joints in my driveshaft with Moog components. After reinstalling it, there was a bad vibration above ~20-30 mph. Being fed up I took the driveshaft to a specialty shop to have them make sure I did the u-joints correctly and balance it.
They replaced the central bearing and supposedly balanced the driveshaft. I installed it today and thought everything was OK. Nope, starting at 35 mph a vibration starts and gets really rough in the low 50's. Once above 60 it somewhat smooths out. The vibration persists with the car in neutral coasting at those same speeds.
I never separated the 2 halves while installing it, and I mads sure (at least I think so) that central bearing was aligned correctly on its mounting plate.
The only thing I didn't double check was that it attached to the diff in the same orientation it was in before originally removing it. My next step is to flip that attachment 180* and see if any thing changes. Besides that I'm at a loss on where to look next.
They replaced the central bearing and supposedly balanced the driveshaft. I installed it today and thought everything was OK. Nope, starting at 35 mph a vibration starts and gets really rough in the low 50's. Once above 60 it somewhat smooths out. The vibration persists with the car in neutral coasting at those same speeds.
I never separated the 2 halves while installing it, and I mads sure (at least I think so) that central bearing was aligned correctly on its mounting plate.
The only thing I didn't double check was that it attached to the diff in the same orientation it was in before originally removing it. My next step is to flip that attachment 180* and see if any thing changes. Besides that I'm at a loss on where to look next.