Differential gear ratio

Jun 23, 2019
2
0
1
30
Nebraska
Sorry if this has been gone over before.. I am working on my 03 mustang GT and considering changing the rear end out to 3.73. The question I have now is what gears are currently in my rear end? Typically that year came with 3.27 8.8....but when I do the wheel test I’m getting 2 axel rotations per one full rotation of the tire! ‍♂️ The tag on the differential say V229H 3L27 88 2L13
please let me know if you have any insight on what’s going on inside that pumpkin.
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