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You don't even have to jack it up put a chalk mark at 6 o'clock on the tire and a chalk mark at nine o'clock on the driveshaft push the truck slowly forward. Look at the drive shaft every 1/4 turn of the tire. If you don't trust watching the drive shaft tape a piece of string to the driveshaft,and count the wraps of string after 1 wheel rotation,use a little common sense for difference,noting where your tape is for anything less than a complete turn of the driveshaft. 2 chalk marks 1 slow push less than 2 minutes. And this eliminates any confusion about rotation counting with a posi.
