you basically want to check for squareness. measure in a box and across to each corner. Or take it to a frame shop. they will be able to check it. they might be able to straighten it also.

how much power are you putting out?
this might be why it is bent.. then again I dont hear this problem from the sierra crwod so much. Mustangs have this problem alot because the frame is built in two pieces with the shell being the middle.


TF