[Norselander]

The easiest thing to do is remove the difference in wheelbase from the frame rails just behind the cab going back. No tank relocation is necessary if you intend to keep the tank in the cab. The driveline will need to be shortened and you -may- wish to adjust the pinion angle of the rear axle.

This is a pretty straight forward mod on '55-59 trucks because the frame rails are essentially parallel and in the same plane (where you cut). On earlier trucks the frames grew narrower towards the front and on older trucks the frames dipped below the cab.

Fish plate and box the cut.