66Impala,
Is there any chance you could post a photo of the steering-column-mounted gear-selector/indicator display?
I know that the 1954 Chevrolet and the 53/54 GMC Hydra-Matic selector/indicator displays are different in appearance. The same-year transmissions are the same for GMC and Chevrolet. However, the carburetor linkages, shifter linkages, and the column displays are also different. However, the 1953/54 GMC and 1954 Chevrolet Hydra-Matic display show the same selections:
From left to right
1. N (Neutral)
2. 1-4
3. 1-3
4. 1-2
5. R (Reverse - which locks as a "Park" when ignition is off)
I am not certain about what is shown on the GMC 1955-1st display (but I would guess that the selector would have the same display as in the 1954 GMC).
Tim
