Gear ratio should be 4.625-to-1 - to verify, check engine compartment and/or rear diff. In engine bay, all the way to the back at top of firewall, either to one side or in the middle, look for a data plate. You can also look on top of radiator rail. On rear, on back of diff near top...may be covered in muck. Will likely say 4625 on it (in very rare cases may say 488 but don't plan on it).

Look here for locker and other info:

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Stay the Trail!