what do you mean too much rpm? are you saying you are at a high rpm? if so i don't see the problem. there shouldn't be any reason to change transfer cases and you also shouldn't be doing any sort of high speed in 4 low. if anything, a differential gear change is what you're after.
The ONLY chlorophyll JK
one more horse power than the average pentastar; [URL="http://www.jeepforum.com/forum/f22/plus-1-horse-power-after-build-2157673"]http://www.jeepforum.com/forum/f22/plus-1-horse-power-after-build-2157673[/URL]
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