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rotorwrench · 09-13-2023, 10:53 AM

1939 was the change year for the new style synchronizer. It requires the 91A 2nd/high shift fork. It will work with the vertical type towers of either single detent or double detent persuasion. The 32 through 35 have the tower that angles back toward the rear. The 91A fork is not a bolt in. Some folks fabricate a fork to fit but I'm not sure how it was done.

Mitchell makes synchro gears to work in their iteration of the model A transmission case.

09-13-2023, 10:53 AM	#5
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,515	Re: 39 gears in Model A drivetrain 1939 was the change year for the new style synchronizer. It requires the 91A 2nd/high shift fork. It will work with the vertical type towers of either single detent or double detent persuasion. The 32 through 35 have the tower that angles back toward the rear. The 91A fork is not a bolt in. Some folks fabricate a fork to fit but I'm not sure how it was done. Mitchell makes synchro gears to work in their iteration of the model A transmission case.