The Super DUKW (if it really is) is based upon the M135/211 GMC automatic power
train (post WW2) as opposed to the real DUKW-353 which is based upon the WW2
AFKWX-353 (cab over CCKW-353). The difference between the AFKWX and the CCKW
basically biol down to the clutch and throttle linkage, carb and manifolds, and
the steering gear box. All things that would be different between a
conventional cab truck and a cab-over from the 40's.
The Super DUKW would have an automatic tranny
Steve