I'm building a 6x6 tractor to haul an equipment lowloader and dump trailer for my construction company. Chassis is a used King Hauler I bought awhile ago.
Installed a F350 tranny/transfer case, which has the motor directly over the tranny instead of in front of the tranny like on semi trucks. This puts the motor right under the Mack cowl, which makes for a tight fit. Also installed a 55 T motor.
I built up the rear springs to a 6 leaf using some of the F350 front axle leafs. This brought the axle spacing slightly closer together, so I had to rework the short dogbone to fit.
Also mounted Fulda lug type offroad tires, so the tractor can get the heavy equipment on site.
The front axle is from a F350 with relocated mounting stock King springs. Also used a F350 front driveshaft. The servos were relocated in order to clear the powered front axle.