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no it has to be up with the windows down.
as for gears, im assuming 2.73s but my dads silverado does 3 lengths on me from 0-60
He was being sarcastic. I'm not sure of rear codes. But you jack back of car up, mark your wheel with chalk and do the same on driveshaft. Turn your wheel one full revolution and while your doing that see how many times your driveshaft turns around, That will be your ratio.