One more question regarding the two speed rear end:
There is a business specialized in parts for Columbia Two Speed Rearends of Fords and Lincolns from 1936 on (Mr. Conelly). He offers every parts needed for shifting the rearend.
What is the main difference to our Auburn Two Speed Rearends?
Perhaps it is possible to use the shifting lever and vacuum valve for Auburn rearends too? Somebody knows more?