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1.) Get the car in the air with your front wheels safely chocked and the transmission in neutral. Parking brake off.
2.) Mark a rear tire in the 12 o'clock position and the quarter panel above it with a piece of tape
3.) Get under the car and mark the driveshaft in the same way; with a mark on the shaft and an orientation mark on the center section (if you can)
Turn the rear wheel one full revolution while counting the number of times the driveshaft spins. If it spins roughly 3.75 times around it will be a 3.73 gear. It helps a lot if you have someone else turn the tire while you count the driveshaft rotations.
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