[jb-ob]

1932 Service Bulletins suggest using 140wt gear oil.

680 gear oil is closer to SAE 250wt (seems same as what Snyder's sell)

460 gear oil is closer to SAE 140wt.

I couldn't shift thru 680 at temps below 40 degrees.

460 was better and still 'smoother' still seems the Bratton's offering.

This was all in a '28 multi-disc tranny which seems to be more sensitive to shift points than a single disc.

Helpful ??, your mileage may vary, JB