Craig,
As per 52vff's comment above, model 1434 is a 1 ton. The 137" wheelbase is the quick way the identify it as being a 1 ton. The 3/4 ton had a slightly shorter wheelbase at 125".

Dave

1966 Chevrolet Caprice 2 Door Hardtop (396 Big Block)
1951 GMC 9434 5 Window (waiting on a 292 transplant)