I'm just getting my Challenger sorted out after years of restoration. One issue I've noticed is a noise/vibration that is coming from the driveshaft when the car is in gear but slowing down (not accelerating). If I place my hand on the transmission tunnel I can feel it (along with hear the noise). It also doesn't happen all the time. Any thoughts? Thanks for the help!

how far does the slip yoke ingauge the tranny, are the ujoints good, are all the flex plate bolts tight a friend had a vibration problem and he thought it was the d/s but turned out to be a broken flex plate.

Too much pinion angle. Do a search and read how to set pinion angle - you have about 500 to pick from

I had a tail shaft housing failure and decided to send my driveshaft out to be balanced. I found it to be off balance as well as being bent at the yoke. I had it cut and rewelded along with being balanced and I lost the vibration.

Pinion Angle is off, my buddy just went through this last week...