Tranny speed sensor and Differential

When i put my engine in the transmission speed sensor broke (responsible for speedo and odometer.) The Plastic housing for the friggin thing costs 90 bucks through mitsu. Anybody ever heard anything about these? Can you guys give me some cruise RPMs for say 55mph with the 4 speed auto?

Theres a grinding noise in my AWD differential. Looks like its a replacement one on it. Where can I get another one cheap?

my 96 auto TSi awd runs less than 2k rpm at 50mph. once you hit 3k rpm you are doing about 70(give or take)

my girlfriends esi is having the same problems but it was just the speedo and odometer. now the odometer works and the speedo just goes up to like 30mph and is always but u learn to drive just by RPMS so it doesnt matter