Check out Randy Domeck's disk brake kit for the front end. It can be easily adapted to any 1.5 ton ( as on mine) and is very well made. His '46 truck is a company workhorse that carries big loads and will stop on a dime.
As for gearing, I went with a '98 Chevy 3500HD dually rear axle. Fits great, you just have to move the spring mounts outboard a bit. Lot's of gearing options for highway speed.
I know there are a lot of folks here who insist on "keeping it original"...but I wanted a classic that I could actually drive. That means updating the driveline, gearing & brakes to make it safe. To each his own I say.
Oh yeah...and the engine is a rebuilt Cummins 4BTAA hooked up to an Allison 6 speed. Hardly original...but workable.
