[Ron in Quincy]

On the 28-29 chassis, the front cross member has raised bosses where the short radiator mounts; the 30-31 chassis front cross member do not have the bosses where the tall radiator mounts.

If you try to use a 28-29 chassis for a 30-31 it is not advisable as the body, when properly shimmed, will set high above the frame.

If you have a 28-29 frame I would suggest you replace the front cross member with a 30-31 front cross member.

Ron