Re: columbia 2 speed
the Columbia was also used in the Lincoln Zephyr and Auburn. The Auburn Columbia unit is on the drivers side where the Fords are on the passinger. The 39 should have a brass tag on the bottom with a possible year date (late 36-40 are the same), the housing is 21 7/8" long, as is the 41 and 35-6, to the backing plate there is a square flange for the backing plate and typical 39 spring shackle housing.
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