Wow that's a lot of info. Thanks to every one for your replies. Didn't mean for this tread to be controversial. I knew I good get some good info on here. There was couple of modifications that I forgot to list (old fart thing)
I have a one piece drive shaft,adjustable track bar and shock mounts have been relocated also the trans has the long tailshaft so the drive shaft is pretty short (swb). I think I will start with changing out the rubber trailing arm bushing with some urethane bushing and check the drive shaft,pinon and trans for alignment. I will post the results when I get all this done.
Thanks again, Kenneth