Diesels routinely require less radiator capacity than gassers, so, it might not be necessary to get a larger radiator, however, some tanker and other working trucks have been seen with 4" cores, don't know where to find in Oz?

Radiator shop might have a more efficient core available as another option.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.