gears

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mark your tire with chaulk or tape, also mark your u joint at the axle, jack up the rear and turn the wheel ccw trans must be in neutral, count how many times the u-joint turns at one full revolution of the tire 3 and a quarter = 3.23 3 and a half rev = 3.55 just short of 4 rev= 3.91 btw if both tires turn the same dirrection you have a suregrip.
 
yep sure dont have ujoints but i can mark the other part and it should be good 8)
 
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