Do you know the specific trans model? It might be more feasible to replace
it with a later model 4 speed automatic. The only add on overdrives I've seen
are for larger American transmissions and are aimed at the light truck market.
There are a few smaller auto trans that were factory reengineered in to 4
speeds by adding a OD section at the front of the transmission. There was a
Japanese trans ( JATCO? ) and a Chrysler Torque Flight that was modified for
use
in the Chrysler Conquest/ Mitisubishi Starion.
Is you car a V8? ( Buick ) Perhaps a mix of Land Rover trans with a tail
shaft from a 2 wd car could work.
As for the 2 speed rear end, the only one I know of ( as a option ) in the US
was the ~ 65-69 Mercury Cougar ( based on the Ford Mustang ) All other 2
speed rear ends are for large trucks and possibly 1930's era for cars.
Harold
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