Had a search for anything on this and couldn't find anything that was related to my issue.. Have an r32 gts4 4 door, just had the gearbox rebuilt and a one piece tailshaft put in the car. It has been fine for a few thousand k's. Today on a trip up to sydney I noticed a drivetrain whine coming from the car at around 100-110km's, it is not really a vibration. Seemed to get worse the faster it went. Also the gearstick felt warm. Through some trial and error, it appears it isn't related to what gear it's in, more the rotational speed.
I'm starting to suspect it's the tailshaft. Just wanted to know if anyones had a similar problem before? Should the tailshaft have been balanced when it was put on? Had the tailshaft made at one shop, and put in at the gbox place.