I've been considering this myself. Literature from Novak reads that it's only the older SM420's that have the weep hole and no seal in the shaft housing. For some reason my 1958 should have had one, but didn't. However, it's also the 1 ton version of the transmission that has the larger front gears on the countershaft.
Let's see... $140 to eliminate a source of oil leakage (and it'll leak regardless of the angle it's at). Oil leakage that will dirty my garage floor and inhibit the performance of the clutch.
I'm more or less sold, just need to send off the shaft to them.
