Skip to main content

I have a pulsing vibration...about every 2 seconds, felt at 60-70MPH. I notice it most in the upper frame of the driver's door. Wheels are balanced, steering is fine(no shake) & shafts seem fine(universals and bolts are tight). Not sure if the ring gear is safety wired....this is my worry. Could it be an indication that the bolts are loosening? Can I verify the bolts with a micro cam through the ZF drain or fill plugs? Thanks.
Original Post

Replies sorted oldest to newest

Don't know if this will help, but when I had my half shafts out, I noticed that the scribed lines across the two halfs were not lined up. In other words, when they were originally balanced, a line was scribed where the two halfs come together so that they could be reassembled correctly and maintain balance.
It might be something to look for.
I changed over to my second set of wheels/tires recenly. They were fine when I removed them about 2 months ago. I always have a small continuous vibration - the rear view mirror shakes under load. When I push in the clutch while driving, the vibration stops.
The pulsing vibration is new....since I changed the rims/tires.
Thanks for the help!
FWIW, loose bolts holding the u-joint flanges to the halfshafts will cause a shake. I found this by accident on a '71 during a run- one bolt of the 16 had a cracked lock-washer that had fallen out, leaving the bolt loose. 3/4-turn tightened it up and thats all it took to cause a shake under power! Since then, this shake-under-acceleration has been found on two more Panteras across the U.S with loose bolts in the halfshafts, so check to see if the bolts are tight in your car!
Link copied to your clipboard.