I have a '55 2nd series 6100 and there is a vacumme diaphram that pulls a small gearbox on the back of the speedo. It compensates for when the rear end switches from high to low so the mph will be correct. The diaphram is rotten and I cant find anyone who carries these, and I even contacted Stewart Warner and they say its unavailable.Any Ideas? By the way, this site has been the best thing to happen with my restoration project! Much Appreciation!
