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I love how people think lift kits increase ground clearance.
approach departure and breakover
But tires do all that and help ground clearance (that's the part under the axles .. I know you know that Kris, it's for all the kiddies ) While keeping you're COG low if you don't lift it a brazillion feet in the air.
i think portal boxes on tons would be sweet, but overkill. it'd be better suited for half tons, gets you that little bit of extra ground clearance, and you don't need to worry so much about ring and pinion strength with portals. you'd be using some numerically low (high) gear set because it would be multiplied by whatever hub ratio, usually a 2 to 1.
d44/9'' 2.50-2.75 gears and a set of 40's=PORTALWIN!!!!!!
U would still have them tinny ball joints on the half tons. Add the leverage of portals( its almost like running a huge lift block) and the half ton front not up to the job.