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RE: '70 T-Bird gear ratio By Dale Cecil - 09/25/2003 11:42:45 PM; IP 63.230.71.238 Mike, Like most cars, there were probably several choices. There are a couple of ways to find out. First, look on the differential housing. All old Fords were equipped with a tag noting the ratio. If you are lucky, the tag is still there, and the original ring gear is still in the car. The other way is to lift the rear of the car with a floor jack under the differential housing so that both rear wheels are off the ground. For safety, support the car with jack stands. Then, mark the drive shaft with a piece of chalk. Also, mark the tire with chalk. Turn the drive shaft with your hand, and the number of times the drive shaft turns per one revolution of the tire will give you your ratio. i.e. If the drive shaft turns 3 1/4 turns to one revolution of the tire, you have a 3.25 ratio. I hope this helps

This thread, so far...

Skip Navigation Links.  '70 T-Bird gear ratio -- Mike, 09/25/2003 RE: '70 T-Bird gear ratio -- Dale Cecil, 09/25/2003  RE: '70 T-Bird gear ratio -- giacamo, 09/26/2003  RE: Thanks to all that helped me out -- Mike, 10/02/2003  Axle code should be on data plate. n/m -- Lou, 10/05/2003

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