DeTomaso Mailing List: March 2001, Message #9

Matt wrote:

>Dennis suggested I get going really fast and shift into neutral. If the 
vibration persists the pretty much rules out the drive train. Tried that 
still vibrates. Specualting now, might i have a bent rim? any way to check 
for that? Bad rotor?

>>>Driveshaft, probably.  U-joints going out.  Could be a slight misalignment 
between gearbox, driveshaft and rear end.  

If the vibration is a function of SPEED and not engine RPM, then it's not in 
the engine.  If you can swap to a different set of wheels/tires and the 
vibration doesn't go away, that confirms that it's between the gearbox and 
the wheels.  I suppose it could be something wacky like a broken shock 
absorber or something, but I'd look to the driveshaft first.

Mike (chased a vibration in the Mustang for a year until I figured out it was 
an intermittant ignition miss....)