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Can something in the trans cause 14% slippage? Turning 6000 rpm in the eighth at 98 mph. Thought convertor was bad, so I put in a new one. Still the same. According to Wallace calculator, I should only be turning about 5200

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Measure the circumference of YOUR rear tires and then do the math on how many feet per minute your running at the finish line If your running bias ply tires you might want to add 1 to 2.5 % to the circumference for tire growth If radial tires don't add anything more to the actual circumference Let us know what you find, tach errors and crummng converters can drive you absolutely NUTS Good luck