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Only problem that I see is I am getting rid of my 31 inch goodyear RT/S tires and putting on 31 inch yoko AT-S. My friend did the exact same swap, identical tire size and all then lost almost 1mpg.
The problem with the goodyears is after 10 years they have dry rotted to the point of tread seperation and they were only good on dry pavement going in a straight line any way. In the rain, snow, mud they would not grip the road at all. If my truck didn't have a factory posi differential I would have gotten stuck in my own yard and my parents drive way numerous times. Being strictly on road only is not good for a work truck that pulls a trailer for fire wood among other things. Few of the trees I cut are right next to the road.
I have the more efficient of the old GM autos, a TH700R4 with converter lock up. Also my truck is a half ton.
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