BignScar, I mounted my ‘37 GMC frame and all on Dana 80 rear axle, solid front axle, power steering and hydro boost brake system(4 wheel 10 lug discs) from a P3500 HD baby school bus. Works out well with modern running gear. Easy to get parts for. Engine is a Detroit diesel 4-53T(but Cummins 5.9 would also fit in there) with RR 10 speed and Brownie. Room in grille for large radiator and i’cooler.

P model GMC’s are getting hard to find but regular pickups also have 10 lug wheels, large engine bay.

Ed
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Last edited by EdPruss; 03/02/2021 8:23 PM.
'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.