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Old 06-09-2003, 06:20 PM
Arthur Dalton Arthur Dalton is offline
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,768
If you want it Exact, take the ratio # of the differential and do the math [ using rolling circumference...]
RC is easily found by checking for proper air pressure and then mark the tire with the ground and push car one wheel revolution, - Measure ground distance covered..
This eliminates guessing on tire circumference and is accurate for each individual car/tire set up..
More accurate , of course, for stand trans [ no OD] vs auto/torque conv.
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