Very odd drivetrain problem.

Hey burrbrian--thank you for your ideas. When you say something binding do you mean a u-joint? And if so do you think possibly a u-joint would cause all this havoc? To add a little more info. This car does not have leaf springs in the back. I am looking at a picture and this is what it does have--"rear stabalizer bar, lower control arms, torque arm, track bar @ track bar brace"--which all seem to be tightly bolted in place with no missing bolts or nuts, and all rubber bushings related/in contact with all these parts are in good shape (rubber is intact, not missing or rotted.) Also there is a "crossmember" thing mounted under the rear of the tranny that is tight, with no missing bolts, and rubber bushing/mount is in good shape. Also I now have found a weight mounted about 3 inches towards the front of the car on the driveshaft just ahead of the rear u-joint that apparently is also slamming into the underbody while spinning. Just to make sure I'm not losing my mind I chalked the ends of the u-joints and the driveshaft weight and took the car for a little spin. And. You guessed it chalk marks slammed/ground in to the under body in all 3 spots. I have yet to check the motor mounts as burrbrian mentioned. Also rear springs are fine--not broke or collapsed, and rear shocks seem to be doing there job. I STILL NEED HELP! By the way, when AND IF this problem gets resolved I will definitely let you know what was found. But at this point I'm not holding my breath. :(

Burrbrian--you put your money on the right thing--it WAS the transmission mount! YOU DA MAN! Well, a combination of the tranny mount being bad AND the last guy that installed it screwing up (the last guy is yours truly!) I had replaced that a long time ago (car doesn't get driven too much.) But, when I had done this I had stripped the nut and simply double-nutted it without realizing that the rear of the tranny was nowhere close to where it SHOULD have been ( it was raised up a couple of inches higher than it should have been, making the nut SEEM like it was tight, but in fact was not close.) After installing the new mount and tightening it the rear of the tranny pulled down a couple of inches making a tight fit between the mount and the crossmember (?Sway bar?) After a test drive (hard test drive :lol: ) all problems were solved ( no clunking, no banging---no parts grinding their way into the underbody of the car!) There apparently is a LOT of torque on these parts, cause as I said before--the rear u-joint was hitting too--which I believe means the whole rear-end system was lifting/twisting under a load.
Anyway, I would not have removed and checked this mount (as it LOOKED and FELT tight)---if it hadn't been for your replies.I THANK YOU VERY MUCHas stated earlier----YOU ARE THE MANTHANKS AGAIN----recaroguy.

Burrbrian--yes, the motoring is going very well! :Twisted: :twisted: Thanks again and I WILL keep an eye on the u-joints--there was some extreme twisting going on under there, so I'm sure all those parts were giving it there best to not explode into tiny pieces--I really appreciate all your help and this extremely helpful website. :) Take care, recaroguy.