Did you get the trans conversion kit from Hermann (HVDA)?? He has instructions in the back of his booklet on determining how far the ratio is off, and what to tell the speedo repair shop when being recalibrated. With that info, you might call Nisonger in NY and find out if they can correct it by changing gears inside. If you need the info on figuring out how to determine the number of turns per mile, PM me, and I'll give you the info from Hermann's instruction manual. It's fairly easy, but will take alot of typing, and I'm heading out right now.