The ST165 final drive has been used by several MR2 Turbo owners. I found this on the MR2OC board:
"3.933 Shaft, Output_______ 33321-20120
3.933 Gear, Ring__________ 41221-12240
3.933 Gear, Oil Pump____ 33407-12011
These part numbers are from an ST165 (88-89 All Trac)"
The MR2T also has the .731 fifth gear like all all-tracs but will rev at about 3100rpm at 60mph IIRC... my ST165 is well below 3000 with about the same tire size.
Personally I love having the wide, long gearing. It's great. I'm used to driving an '85 MR2 which revs about 3300 at 60mph, though