I'm pretty good on knowledge of the NAPCO stuff, but I don't know a lot about AD trucks. If it wasn't for the tapered in frame on the AD, I'd just hang NAPCO axles on the original set up. The spring perches on NAPCO axles are cast into the housing and can't be moved. We'll see how it goes.

George

1954 Chevy 6400 2-Ton
1955 Second Series Napco 4 x 4 Suburban Carryall
1966 Chevrolet K-10 -- Sold to another 'Bolter