The speedometer on my signature car has always read about 6% fast. Recently, I checked the odometer against my truck, and it is also fast by about the same amount. Before I purchased the car, the transmission was replaced with a MB rebuilt unit. Dividing 2.88 by 3.07 (the current axle ratio) gives me about the same error (.938). I would suspect that the transmission has the drive gear for the 2.88 ratio. What is the best (or easiest) way to correct this error?

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'83 300D, 126K miles.