Re: 1931 ccpu on 1929 chassis
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
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