Re: 1939 transmission spec
There is no written spec that i have ever been able to learn. Assuming you are referring to the mainshaft endplay in the case itself, on a closed drive trans, with the rear bearing snap ring installed and the rear gasket in place, install the rear bearing retainer and tighten it with at least two bolts. Then, install the u joint with its special bolt & washer to the mainshaft.
If you can feel any fore & aft movement when you try to move the mainshaft, the best way to minimize that is to use a thicker rear snap ring (51A-7070). We stock them up to .075" thick.
The same scenario for the front bearing snap (b-7026). We carry two brands of trans gaskets as one brand uses thicker paper for their front & rear retainer gaskets than the other. It all adds up and you don't want the input and output shafts moving apart that much.
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