I pulled the tranny to replace a slave, did it in a hurry and didn't mark the bolts on the ds like I usually do. I bolted it back up and torqued everything to like 80 ft lbs. I started getting a vibration in all kinds of speed ranges (not rpm related) and it would get really bad with the clutch in or neutral. (especially 40+) Sounds like thumping / rubbing noises like the biscuit is beating on something... If I'm actually driving in gear with a little throttle it feels nice and smooth, no noise, soon as I let off the gas and coast in gear, or go into neutral, etc. it gets really audible. Its even enough to send a few vibes here and there through the steering wheel too... but not much.
I put it back on jack stands and the rear donut was super wavy between bolts, strange. Anyway so I found the right torque specs and fixed them and attempted to line up the ds and adapters like they were previously. FYI, don't use a sharpie! After driving it some, the donut straightened out, however vibration is still there. (Thread I had about it http://www.ls1gto.com/forums/showthread.php?t=298184
Then I realized when when I installed new mid-pipes it pulled the cat-back forward and it looked like they donut & diff were VERY close to the pipes. As the sound is kind of a shuddering or beating sound, not so much vibration, so that was plausible, plus that's where the sound is being generated from.
So I beat the pipes in a bit in that area, which gave me plenty of clearance, so I don't think that's the culprit.
Basically I've narrowed it down to the carrier bearing, or the front yoke adapter is still not lined up where it was previously and this caused the ds to be out of balance... I may try to rotate that front again. The rear I found my old markings and got it back in line.
So basically how do I know if the carrier bearing is bad, anyway to test it with the car jacked up? I've never had any vibration issues before, so I know its not the clutch, and my rearend has never whined or had issues either.
Anyone have any other ideas, I've been through a hundred threads on the issue and everyone seems to get lucky and have bolts loose... not my f'ing luck. I've checked them all, including all the half shafts, etc.
Today is the first day its been 70 out and all I want to do is drive the car...
I ran the car on jackstands for a bit while peeking underneath, couldn't really tell anything from looking with my hand on a stick pushing the throttle. I did notice the driverside axle seems to make a slight popping/chatter occasionally as it was spinning, but again, its hanging in the air so not sure if that's normal. Both axles move freely back in and out of the inner/outer joints, but the driver side seems to have a very minute play in it towards the outer joint, the wheel will turn very slightly, yet the inner joint doesn't move. The passenger side didn't exhibit this behavior.
I'm stumped... if its this axle, what kind of coincidence is this... I still think its the drive shaft...