Weeds,
I used to have a 1/2 ton 51 that was restored with the conversion
kit offered by "Patricks". This rear-end kit involves the ring and pinion gear swap only I think. Patricks, nor anyone else seems to offer the same conversion for our 1 tons. I called Patrick's seeking advice. An old timer there told me the entire rear end from an 88-92 Ford 1 ton Van would bolt right up and give me the increased speed I was seeking. I found one in a junk yard for $75. He was right, It bolted right in. I'm not finished with my restoration, but will update everyone once I get it on the road.