hey guys, looking for anyone who's had a problem like this. I had a new clutch put in, then the transmission started to move 2-3 inches [up] during hard or medium starts. I changed the control rods bushings, same thing. The driveline support beam looks tight too. The only other thing would be the rearend to body bushings. Just want to no if i'm rite or wrong.

 

Have to make sure that the bolts than attach the channel to the rearend are secure. Rearend bushings, unless they are completely gone, probably not the culprit. You say the support beam "looks" tight, but check with a wrench. It the problem started after the clutch install, then that probably is the culprit.