I JUST CHANGED OUT THE UNIVERSAL JOINTS ON MY Z AND I TOOK IT FOR A DRIVE ON THE HIGHWAY. I WAS GOING ABOUT 85MPH AND MY CAR STARTED VIBERATING REAL BAD. I PUT ALL THE C CLIPS IN PLACE AND I MADE SURE EVERYTHING WAS LINED UP. I ONLY NOTICED ONE WEIGHT ON THE SHAFT WHEN I TOOK IT OFF. DO I HAVE TO GET IT BALANCED? THANKS

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Make: Chevrolet
Model: Z28 Camaro Convertible
Year: 1991
Car Setup: stock
Engine Components: Comp Cam
Exhaust: DYNOMAX
Ignition: MSD
Intake: K&N
infopop.com

 

If it is a steel drive shaft, it will always vibrate at that speed. You need to get an aluminum one.

 

Try rotating shaft 180 degrees on rear diff. I like to put alignment marks on shaft and pinion yoke to get it back on there as it was before.

Both my 89 Formula 350 and 71 RS Camaro have steel shafts and do not vibrate at 100.