how can i tell my axle ratio?
there is usually a tag on Fords, and Gm has a number on the drivers side top of axle. If all else fails, jack the rear of the car up, put jackstands under it, put the car in neutral, spin the driveshaft one revolution, and see how many times the tire goes around. If you spin the driveshaft once, and the tire goes around 3 and a half times, you have a 3.50 gear, and so forth. It will be approximate!
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If it is an original axle, Take down your vin # (bottom drivers side of windshield) and call a dealership. If not, look for stampin in the differential with a manufacturer and part number then google it.
