I think your CCKW has 5 on 8" bolt pattern, doesn't matter what it is, I made somewhat easily(if my labor doesn't count for anything) wheel adapters to go from 8 lug D 70 rear end(could be done to GM 14 bolt, etc.) to 5 on 8 for my KB-5. GM 14 bolts are plentiful and inexpensive, have lots of ratios available, come in singles and duals. D 70 an D80 would work also, expensive, though.


'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.