created the thread Sudden Drivetrain Hum at the Track - Broken Component?
" Setup - FBO E92, 6MT, NT05R DRs, and wavetrac LSD
Did a good 10 runs or so at the 1/4 track, one of which had a hard pop during launch. I got ittermittant wheel hop on a run, but nothing bad. On the last run, I could hear a loud hum at the too of third and into fourth gear.
When dirving home I noticed at low rpms there is a vibration and an audible him throughout the RPM band.
I've mounted the center bearing upside down on the frame on my old car (e92) and it feels like that vibration, just not as bad (but just as audible). I put the car on jack stands and can't visually see anything wrong with the rear axles, diff, or diff output.
Any ideas on how to diagnose this and what could be wrong? "
05-09-2013, 01:53 AM