I have a 3-speed overdrive transmission and am trying to determine whether it might be original to the car (1954 Crestline Victoria V8).

The case is cast 1A-7006-A on top and 3BP on the bottom. The overdrive tail shaft is marked R10F-1 W9 and K233. Transmission length from bellhousing flange to end of tail shaft is just shy of 28”.

I appreciate any assistance determining the original application of this transmission.

1954 Crestline Victoria 312 4-bbl, 3-speed overdrive