super t10's shouldn't be confused with the original t10's that came out in the '50's (IIRC 1957), and this includes all the early '60s t10's. there was a 2.32 first gear set that ford and amc used and I always thought Chrysler used that gear set in '63. there's a 2.54 low gear set. the super t10 was borg warners attempt to revive the brand. they were stronger but IIRC correctly they were iron cases rather than alum.