1.5T is the 4000 series, the 3800 is a 1 ton, which is all the same size stuff as a 1/2T ...

the complete 56 cab and front will fit the 58, but you'll need to cut a couple inches off the 58 frame
[like this 57 on a 58 frame]

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot