Find a carrier from any 3/4 ton pickup from '46 - '72. You can get 3.90:1, 4.10:1, or 4.55:1 gear ratios.

4.55 is what you're going to find the most of.

Try to find an Automatic. These generally had the lower gear ratios.

I can't help you with the Posi question, though. Sorry.

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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.