T.T. rumble at idle
 

I'm frustrated! 05 C6 A4 bought 4 months ago with 3-4 band burnt I R&R'd the tranny, replaced the guibos and bearings in the T.T. while at it! The rear guibo was shredded pretty badly. I now have the T.T. rumble :-( , Using a long screwdriver to the ear you can definitely tell the clicking rumble is coming from the rear bearing area. It only does it at idle & doesn't matter if in P.R.N or D, raise the rpm a 100 rpm and all is quiet. I just pulled it all down again, I found that the the big input nut was only at about 40 ft.lbs. so I torqued it to 93 lbs and the corresponding hub that houses the 2 rear bearings felt tighter (less play but rolled very smoothly) I reassembled the torque tube put on stands and spun it up with a drill. It still made some noises at the same area, so I put in 2 new bearings and that didn't change a thing, The run out of the shaft is minimal! The bearings and shaft roll freely and feel fantastic. Any ideas guys and gals?
thanks

And I really thought Ford was crazy for using giubos on its Transits. I had no idea that the Corvette was using them. Having a rag joint in a drivetrain just seems like a very bad idea. I wonder if the C6 and C7 used them.

FWIW, I noticed that a few Transit owners are complaining about some type of rumble before the giubo joints go bad.

Update!
 

The rumble was from the Large nut on the rear of the TT. (holds 2 flanges in the bearing housing) Not being torqued tight enough!

Thanks for the update. Might help somebody in the future looking for this problem. Probably a good thing that you found it when you did as it would have probably caused some serious damage had you not.