I bought a 1972 Chevy Cheyene 10 a few months ago and and am getting it road worthy. Do I need to remove the box to put in new cab corners? And if I do how hard is it, it looks like just 8 bolts and the tail light wires, am I missing anything? Also when I first got the truck it braked really well (has power brakes) but the rear brakes locked up first. The truck needed to have a saftey inspection and to pass it needed new rear brakes, so after putting on new drums, shoes, parking brake cables and all the other rear brake springs it now skids the front tires first but the brake light comes on and it does not seem to have the same brakeing power as before?!?!?! I would really appreciate some advice. ROB