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You should see the stuff that's going on with the new moon buggies. For strictily off-road use, it works fine as long as it isn't binding. On the road, you might wear out u-joints a bit faster than normal, but as long as the angle isn't too severe and they are close to opposite each other they should work fine with a regular driveshaft.

However, this setup would in theory play hell on a CV driveshaft at highway speeds due to the unmatched angles. You'd have nothing canceling out the sideways angle of the pinion u-joint (unless you offset the pumpkin to match the t-case output, which I assume you're not planning on doing) and serious vibration would occur. Stick with a classic single u-joint on each end and it should work fine so long as the angles aren't too exaggerated.
 

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I don't think 4 inches at that height in the truck will make or break you.... it will be noticable, but I think you will be ok. The higher you go with the driveline, the more pronounced the difference will be. If you're really worried about it, you can take some steps to counter the weight by moving stuff (battery, fuel tank, etc.) over to the other side of the truck to even things out. Think of the difference it makes having a 200 lb. passenger in your truck while wheeling vs driving alone, and realize it will be far less severe of a change than that.

As a sidenote - they offset the BB chrysler engines in the late 60's barracudas 2.5" or so to the passengers side from the factory to clear the steering shaft.... and over the years many other vehicles have come from the factory with offset drivelines to varying degrees. Just to put things in perspective a bit.
 
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