You would want a "Q" Box that came in Discovery 2's and even 1's they will only be in the 1.22 ratio.
You have an LT230T in your truck.. Be sure to get a Q box with a Diff loc. They are Identical so the swap would be uneventful.
You already have the tallest diff gears in your truck. at 3.54:1. I would suspect that with a higher ratio you would be disapointed with the performance and your would cause additional stain to your already senior engine.
The 3.9 could go as long as any other V8 is properly maintained.
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