WTB 4.10 gear from 67 to 72 3/4 ton truck or van

[kaleido]

I am new to this list and my old 1950 3/4 ton truck needs some pep. I am told that the third pumpkin member from a 1967 -1972 3/4 ton chevy/gm truck or van with automatic transmission is a direct change out for my old truck and can get me going faster than 45 mph. Any leads will be apprechiated. Willing to pay a good price for the gear + shipping. I am in the Houston, Texas region. you can emial me directly at daniel.robinson@prodigy.net