I would assume the new gears will be more than up to the situtations they're designed to address in the first place. The rest of the drivetrain is plenty beefy to deal with the added stress that the lower gearing will send out of the transfer case. The only point of concern that comes to mind is that late 2000-built and up models of the transfer case use a narrower chain to send power to the front driveshaft than the older models, and one guy has already stretched his. This could be a weak point that becomes more apparent with the lower gearing.
Brent
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