I have an 87 dakota, 2wd, 3.9l, i was wondering how much play should there be at the yolk that slides into the tailshaft of the transmission? what i have seems like an awful lot. i am getting a vibration and the truck bounces while driving at any speed. gets worst above 55 mph. any help

 

not sure about the yolk play...the truck bounces? how do the transmission and motor mounts look? what about the play in the u-joints?

 

There should be about an inch play in the yolk, Are you sure someone hasnt put a new driveshaft in it

 

Sounds like you have a seized U-Joint thats not allowing the driveshaft to rotate properly