how do i tell what gear ratio i have
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Searching "axle codes" returned about a million posts, more or less. Try this one
https://www.f150online.com/forums/sh...ght=axle+codes
https://www.f150online.com/forums/sh...ght=axle+codes
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Originally Posted by glc
If you can turn it easily and the driveshaft rotates, you don't have limited slip.
Originally Posted by Steve83
The first digit tells the chassis weight & type of diff; the 2nd tells the ratio; if there's a 3rd digit (4WD only), it means the front diff is limited slip. In the first digit, 1 is the code for most 1/2-ton open diffs; 2 can be 1/2- or 3/4-ton open; H is a 1/2-ton limited slip. (Any letter in the first digit means L/S.) In the 2nd digit, 2 = 2.73; 3 = 5.13; 4 = 3.54; 5 = 4.10; 6 = 3.73; 7 = 3.31; 8 = 3.08 (or sometimes 4.88); 9 = 3.55.