^^^^^^That(high pinion/low pinion)and ratio should be the only difference. But I also heard that putting a HP in a 00-01 XJ with no lift you may run into driveshaft -to-exhaust contact problems.
brackets match, but unlimitless is right, i have a buddy that has hd that same problem. a Cherokee with anything greater than 2-3 inches of lift should have no contact problems, however.
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