pull the tranny, open the case, remove the gear clusters....
and it will cost about 800+ for a GOOD LSD.
but its fun to talk to my buddy with his 4x4 ram, and tell him my diff is a 4.2, he only has like a 4.11 or something. then again, he doesn't have a 9k redline.
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Eat a live toad every morning, and that will be the worst thing to happen every day.