Phil--Thanks for the info. Sounds like it's time for me to do some more research. That would really help narrow down the search for a T-5 with the ratios I want. Thanks. John.

'68 C-10 - 250 with Edelbrock 600cfm 4 barrel, Offy intake, Hedman headers and true duals, HEI, MSD 6A box, relocated gas tank
Soon to have: T-5 tranny