with the extended military shackles you will be able to fit 35's under with a little wider off set wheel, i know that it won't rub on the leafs or the frame at full lock however i cannot say whether or not any fender trimming would be required for the extreme flex situations.
also once you get the military shackles you might have vibration problems in the stock 88" driveshafts which can easily be fixed with a high angle U Joint or CV joint on the rear. on the 88" you'll also have to be careful of the front drive shaft rubbing on one of the crossmembers in the hairy flex situations.
i had heard that as a result of just placing the extended/military shackles on the truck it can throw the angles off between the differentials, both front and back, and the transfer case. (the military frames came with a different length fixed spring mount on the chassis to keep the angles correct). to fix the problem all you would need to do is place a wedge shaped piece of metal between the axle housing and the springs and tighten the U-bolts down to correct the angles
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