So, I have this odd SR drivetrain problem..

[Fredy]

Well for starters, the symptoms:
-Between the speeds of 30-65 mph, there is this clunking (like change in a glass jar) and grinding sound as well as the accompanying vibration in the shifter.
-Driving under 30 drives just like it always has.
-Once I hit 65, the clunking/vibration/grinding/death growl of doom magically goes away.
-Death growl (as i like to call it) seems to be speed dependent and not gearing related (doesn't matter what gear I'm in when the growl starts).
-No grinds when shifting.
-No shifting problems at any point other than the occasional 5th gear pop out.
-I have a slight (like this much _________) rotational play in the driveshaft where it connects to the tranny (don't know if that helps).
-Already checked to make sure the exhaust heat shield does not make contact with the drive shaft, no issues there.

Specs:
-S13 Chassis
-Blacktop SR20
-Full 3" exhaust
-Welded diff

Don't have any clue as to what the problem might be at this point, any help would be appreciated. Thanks.

[fliprayzin240sx]

Driveshaft carrier or U-joints might be fawked...