Great question. Each state has it's own rules. If the frame you are putting it on has a Serial number, you get into a Fuzzy area. If it has NO frame serial number or what they call a Secondary V.I.N. you can put a titled cab on it with ease in CA. Only thing checked is Original V.I.N. plate to the actual title . Unless frame had a Secondary which I think started around 1955 universally. The same goes for putting your cab on an S-10 Frame. Now you have a Secondary V.I.N. on the frame so it's usually verified by a local Law Agency (in Ca. The C.H.P.) to first make sure it's not Stolen then the combined are processed for a new title.
