Overdrive options include but not limited to:
Manual:
SM319 Muncie 3 speed w/BW overdrive, factory option for 55-65 trucks. Available, reasonable.
Saganaw 3 speed w/BW overdrive, factory option for 66-70 trucks. Limited availability, costly.
A833 New Process 4 speed OD, used on mid 80's GM trucks and misc Mopar vehicles. Rare, costly
5 speed factory option used on late 80's/90's trucks. Unknown availability, cost
BW T-5 used in S10 vehicles 80's & 90's. Available, reasonable
Gear Vendors OD w/adapter. Use existing SM420 4 speed trans, bring lots of money
Automatic
700R4, available, semi reasonable
2004R, available, semi reasonable
Fred
Note: All of the above will require driveshaft mods, some will require shift linkage changes.
