In order to identify which gear kit you require you will need to know the serial number of your transfer box. The serial number will be stamped either under the filler plug or on the flat surface at the top of the rectangular sump plate.
Your serial number will have a Prefix starting with 2 numbers then a letter D. (i.e 22D).
Your Serial number will end with a letter, this is the Suffix.
We also recommend a visual inspection of your current gearset. This will require you to remove the sump plate and inspect.