I just recently installed 3.73s in my 91 RS which HAD 2.73s. ok the problem now starts because all the dealerships around my area say that since no cars in 91 were equipped with 3.73s, i cannot get them. So im told i have to get something called a "reducer" which i dont even know what it is. what do i do? i anyone knows if any cars were made with 3.73s STOCK in 91 please let me know or what i should do. PLEASE HELP

 

I did the same swap in my 91 camaro and had the same problem at the dealership. Finally found the numbers here on the board. The part numbers are:
8642620 gear
25513051 gear
10456089 speed sensor

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Michelle
92 Formula 350