For the AD trucks the 1.5 ton standard axle is a light weight, and the 1.5 ton heavy axle is more like (eaxctly?) like the 2 ton, same spindles and king pins.
I'm no expert on the older trucks but in my research the common 40's and 50's and even 60's GM 2 ton kingpin size is 1.109", and a lot of stuff interchanges around that.
So if you have 1.109" kingpins you can use spindles, hubs, brakes and all off another axle with the same king pin size. What that should mean is if this brake kit in question is designed for an axle that uses a 1.109" kingpin then if not direct fitting then by swapping spindles and hubs you should be able to use it on 2 ton and heavy 1.5 ton trucks up into the 60's, so long as they have the same kingpin size. Only downside and question to be answered is what are the differences in spindles for mounting the caliper bracket, and hub for mounting the rotor adapter for all those year trucks. That'll tell you when you need to swap spindles and hubs to make the kit work and then what year range do those parts have to come from.
Keep in mind that the hub pilot diameter on these 5/10 lug trucks was 4.75" in the late 40's to about 1955, from then on they went to 5.25" center hole in the wheels/pilot on the hub. This will be good to remember when and if you start swapping spindles and hubs around and weather you want old or newer wheels. All 19.5" and 22.5" tubeless wheels with this 10 lug on a 7.25" circle bolt pattern have 5.25" center hole.
Grigg
