50GMC...I just don't see the error...except that maybe in the repops those pages should be inserted into the '54 manual. The one change for '55.1 is well-known knowledge. The few times I've bought something that was wrong for any of my projects (due to ignorance, miscalculation, whatever), I've just used the company's return policy to send the parts back (and if that was impractical, eBay to get some of the money back).
As far as vendor dealings go, I have only had an issue with one vendor, and that wasnt on a sale or return...just general rudeness and stupidity. I won't do business with them, and if someone asks about their service, I tell them I wasn't impressed.
atomarc, it's not the main difference, it's the only difference...and then only on 1/2-ton models. :p At least Chebby gave them a model year split...GMC just switched drivelines and kept calling them '54s.
