An SM420 should work, as should the old "coffee grinder" fourspeed from the 30's and early to mid 40's -- so long as you've got one from a 3/4 ton or larger.

A 3 speed from a late fifties model (SM318?) should do the trick too.

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1946 Chevrolet 3600 - "Old Number Seven"

Cavalry's Here. Cavalry's a frightened guy with a rock, but it's here.