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Rear axle gear ratio?

7K views 4 replies 5 participants last post by  mhatlen 
#1 ·
How can I determine the gear ratio on a rear axle on a 07 350 rear axle. Axle came off a 4x4. Bought axle off parts truck. Dont have vin info or sticker on axle to research the ratio information.
 
#4 ·
I didnt click the video, but if you mark your driveshaft, and mark one of your wheels, then with the rear wheels jacked up, rotate the wheel and count the revolutions compared between the two.

I have done this one a few Mustangs and its easy to tell the difference between a 3.73 and a 4.10.
 
#5 ·
The tag on the rear end also tells you the pinion and ring gear teeth #

Almost every F250 has 3.73 but there are some lucky basdards out there with 4:10 too

The cab and chassis are commonly with 4:30
 
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