All 1954, '55 and '56 Ford full size sedan frames are identical, regardless of 2-dr or 4-dr. The 2-dr hardtop frames are different from the sedans and the wagon model frames are different at the rear, besides the wagons having heavier front springs, 7-leaf rear springs in lieu of 5-leaf for the car models and the wagon has a heavier front anti-sway bar.
transmission crossmembers and driveshaft lengths vary across the spectrum depending on engine/transmissions used. Wagon models had an integral housing rearend rather than a banjo housing type.