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{{youcanedit}} ==Rotating the tires method== With a standard differential raise one wheel off of the ground, mark the tire at the 6:00 position, mark the drive shaft. Turn the tire exactly 2 full turns. Count the number of times that the drive shaft turns. 2 3/4 turns of the drive shaft = 2.73, just past 3 turns = 3.08, 3 1/3 = 3.23 or 3.31, almost 3 1/2 = 3.42, just past 3 1/2 = 3.55, 3 3/4 = 3.73, just past 4 = 4.10 or 4.11. With a good solid limited slip differential (posi) raise both wheels off of the ground and turn both wheels exactly 1 full turn. Everything else is the same as above. You can also do this with a standard differential as long as both wheels turn exactly 1 full turn. This is much easier with 2 or 3 people. ==Optional method== If there is a removable cover on the differential you can count the teeth on the ring and pinion gears. Count the teeth on the pinion now. Then divide the number of teeth on the pinion into the number of teeth into the ring gear and you have the ratio. For example: 41 divided by 10 = a 4.10 ratio 40 divided by 13 = 3.08 [[Category:Rearend]] [[Category:Good articles]]
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