I had a centerforce clutch put in a few weeks ago and I noticed a vibration that starts at 75mph. It's not severe but it's definitely noticable. It seems like its coming from the rear of my car. I never had this before. Any ideas?

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90 Black Formula
5.0 TPI 5spd lotsamods

 

Try unstraping the rear U-Joints and roatating the driveshaft 180 degrees-when you had the cluch changed they may not have put it back in the same way and that will cause it to vibrate. (I did the same thing the 1st time I took the driveshaft out on mine.)

 

84Z28350 is correct. That will definitely do it. I did the same thing when I swapped trannies. Had a subtle vibe. Rotated the d/s 180* and that solved it.