This morning, I tried to put my truck in REVERSE but the gear shifter just loosened up and did not engage. I then tried to shift the truck back into PARK but it would only go as far as REVERSE. I could not shift anymore so I just turned off the truck while it was in REVERSE. Now my truck won't start. Does anybody have any suggestions? I have a 2001 2WD V8 with 162000 miles.