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rotorwrench · 01-07-2019, 07:40 PM

When folks mention "1939" transmission I always wonder if it really is all 1939 or a mishmash of parts from several different boxes. You need to be sure you have the 91A shift fork. If it is some modified earlier one then it won't shift all the way into direct drive. When you are in Hi gear its 1:1 drive straight through so only the synchro is involved with this position and it has to have that 91A fork to work with the 1939 & later type synchro assembly.

01-07-2019, 07:40 PM	#5
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,431	Re: 1939 transmission fault When folks mention "1939" transmission I always wonder if it really is all 1939 or a mishmash of parts from several different boxes. You need to be sure you have the 91A shift fork. If it is some modified earlier one then it won't shift all the way into direct drive. When you are in Hi gear its 1:1 drive straight through so only the synchro is involved with this position and it has to have that 91A fork to work with the 1939 & later type synchro assembly.