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My TF had the original 4.8 rear and to my knowledge, the original speedometer. The speedo always read high in relation to a GPS unit. I was going to send it out for adjustment. Dave Clark built me a 4.1 rear and I love it! But, since the new rear was installed, the speedo and GPS appear to be reading exactly the same, how crazy is that. We went for a ride the other day and the wife was comparing the GPS to the speedo and she said they are reading exactly the same. That saved me a couple bucks!
But it's still a mystery!
But it's still a mystery!