how much will 4.10's throw off my speedo?
#5
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You never got that tuned or calibrated? Your car will read 60k miles when you really only have 50-55k miles on the clock in no time at all. But to each his own.
#6
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Being off by a percentage, the faster you go, the further off your speed will read. A tool I use to verify gears when I buy a vehicle can be found at http://www.f-body.org/gears/ ... Very customizable tool to determine what actual speed you would be travelling in each gear at any given RPM. Saves a lot of tedious math.