Some weird vibrating that needs to be fixed!

MtNemoMopar said
Go down the road, throw it into neutral, then shut off the engine, just to make sure it isn't a flex plate, dampner, engine,etc vibration. I had a bad dampner once that drove me crazy. I also would check your driveshaft angles. Vibrations can drive a person mad.

I did this and it still vibrated! So this left my problem to the driveshaft or rearend. Good suggestion :thumblef:

OK! I parked the car in neutral and took a look at the drive shaft. Lo and behold the damn yoke was loose in the extension housing. Not to mention the fact that 2/3 of the yoke was outside the extension housing. So... I took the old driveshaft from the 318/904/7 1/4 setup (which was 12 inches too long) and swapped the yoke so I could take a good measurement. Looks like it's 6" too long. So the next day I brought it right in to work, cut the yoke off on the band saw right at the old weld and cut 6" off of the drive shaft nice and square. Welded it back on with the tig machine. I two-passed it, I keyholed the whole root with a 3/32 gap and walked the cup on the cap.

The vibration I felt on the car before is totally gone, but the drive shaft could use a balancing (it vibrates just a tiny bit due to an unbalanced driveshaft, at least a vibration I am familiar with LOL). Problem solved :cheers: Beside a leaky tranny line (which I replaced with stainless 3/8 tubing and compression fittings, ALSO courtesy of my place of employment LOL) and a leaky intake gasket, the swinger is running like a very angry, re-awakened 35 year old beast :)