[gomowgto]

My drive shaft got out of balance, unbeknownst to me. Took it in to have transmission work done, shop said I needed a new front yoke. Got the car back and through 1st, 2nd and 3rd gears it was fine. Once in to 4th gear and above 45 mph there was a slight vibration between 45 and 50 mph. Got above that, it went away. By the time I realized it was getting worse, another shop looked at it because the one that worked on it previously had closed and moved. This shop said in the process of the old shop using a hammer instead of press to separate the u joint for yoke replacement, he hit and dented the drive shaft.
The vibration took out the tail shaft bushing, so $450 later for a new bushing and a new drive shaft, the vibration was gone.

[geeteeohguy]

Originally Posted by gomowgto

My drive shaft got out of balance, unbeknownst to me. Took it in to have transmission work done, shop said I needed a new front yoke. Got the car back and through 1st, 2nd and 3rd gears it was fine. Once in to 4th gear and above 45 mph there was a slight vibration between 45 and 50 mph. Got above that, it went away. By the time I realized it was getting worse, another shop looked at it because the one that worked on it previously had closed and moved. This shop said in the process of the old shop using a hammer instead of press to separate the u joint for yoke replacement, he hit and dented the drive shaft.
The vibration took out the tail shaft bushing, so $450 later for a new bushing and a new drive shaft, the vibration was gone.

Same exact thing with my '65 GTO about 30 years ago. After the driveshaft was fixed, I installed a new front yoke (old one was saddled) and new rear trans bushing and seal (Muncie 4 speed) and it's been fine ever since. It was just a small dent, too.

[1967gto1]

Reviving this thread. Still don't have this problem fixed. I put it on the back burner while I was trying to put the car back together. Now that the car is back together and drivable, I decided to take the driveshaft off and push the car out of the basement. It still has that binding problem. Seems to me the popping sound is coming from the rear of the car. Before I took the driveshaft off, I had both rear wheels off the ground and spun the tires by hand and as I was turning the wheel It would get harder to turn before it got easier again. I'm not sure if that is normal or not. I guess I need to add the limited slip diff fluid before I go any further just to see if that helps. Should have done that sooner before doing all this other stuff.

[helmerrock]

Sounds like a bad u joint. You should check it. Easy fix