Alright, I did some uber careful measuring of the rear gears. Some look rather old but nothing too bad the first gear and fourth gear are both warped, only a bit though. so now the question is how do I replace this? I cant find any place that carries new freewheels so change to cassette? Theres the other problem, the trek 1100 and other aluminum frames of the year had a rear wheel spacing of 126mm.

any help is really appreciated guys.