Bill, the Stratoflight is the new-for-56 and 57 Trans, same X-frame as 55.
A friend (Pontiac Pat, you know him Bill) made the transition from Stratoflight to dual-range in a 56 Star Chief. He didn't like the Stratoflight. Pretty big job, including exchanging the steering column.
Changing a 55 dual-range to Stratoflight could be done, bolting in the transmission would be the easy part. Then there is the steering column, linkage, drive shaft, cross member, water cooling, and probably other things I don't know about. Not advised. The dual-range is considered by some to be the better transmission.
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Larry Gorden
POCI 1956 Tech Adviser
www.PontiacSafari.com
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