Can you update yours with parts from a newer transmission, or swap the whole transmission? Might be easier or cheaper?

As I said before, I was running the new one with seal and swapped to one without, no wet clutch problems. And I've probably been on some of the steepest hills you'll find on the road.
http://rides.webshots.com/photo/2773741010080251109pNtppj (downtown San Francisco)

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-