The one issue with swapping axles from a smaller truck into a larger is that the wheels will not fill the wheel wells as well. In my opinion it makes the trucks look kinda goofy a lot of the time.
Why are you looking to swap out axles or transmission at all? You could add an auxiliary overdrive to get you higher road speed a lot easier than changing axles or transmission. Also going smaller axles will reduce the load capacity to that of the 1ton they came from. I would change out engine and trans before I would swap axles....I just can't see reducing the capacity of the truck....even if you aren't planning on using it.
If you have 20" spoke hubs, 22.5 rims will be a direct replacement, and will get you radial tubeless tires along with a greater selection and availability. 10x20 and 11x22.5 are the same diameter tire.
I would think that for the size of truck power brakes would be standard. I could be wrong though, but it seems like a lot of weight to stop without assist. Power steering would be more likely to be optional though.
Tad
1946 Chevy OS 1.5ton, 1955 GMC 3100, along with other various IH,Ford,Nash,MGB,.....
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