i havent been keeping up with his thread so might have missed somethings, but wanted to ask why you have 275/50 tires on the rear? probably came with the car, but that is a very short tire under 26", the stock size was 27.5". could that be all or part of the 10-15mph difference? might be a good idea to get the right size tire on the back & go from there to change the speedo gears or just live with it like it is for now so you're not stuck with that small size tire forever?
have you checked the pass side axle tube for the code to verify the gear ratio if they are original? it would be a 3.42, not 3.43.
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