this one's got me stumped. yesterday i was messing around on my truck, putting a new muffler and plug wires on. i've got my Tcase shimmed down so i raised it up to gain more clearance for the plug wires. the weird thing is, when i went to test drive it around the block, the shifter wouldnt go past D. it was getting dark so i just parked it. this morning i look under the truck and see that the shifter linkage now hits the header/y-pipe. the headers have been on there for over a year without interference, and i only unbolted the exhaust after the cat. the other strange thing is the exhaust clearance. with the Tcase dropped i had to bend the inner lip of the frame where the y-pipe connects to the cat for clearance. now there is almost a 1" space between them. i cant figure out how this happened. any ideas?