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Originally Posted by gtOmologato
I have a 2006 Chevy Silverado, 2wd, 4.3, AT with rubber floors and crank windows.
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The GMT800 was never officially available in my country, and most of the private imports that I have seen were Suburbans. The only GMT800 Silverado that I have ever seen was a 2500 crew-cab with the Duramax, registered in Uruguay where it had been available officially for a while.
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The tune by blackbear performance really helped with the fuel mileage, mostly trans tuning. The TC used to lock up at 46mph min, now it will lock up at 34mph with no lugging 
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What about the engine? Have you considered any mod to it? Since it's basically 3/4 of a 350 small-block Chevy, might not be so hard to get it modded to improve low-end torque in order to allow you to keep it at lower RPM and match it with a higher differential ratio.