he posts on ls1tech.com a lot. The truck was purchased with a 4.8L 4L60E trans. He did a motor swap from a junkyard 6.0L(if i remember correctly) stock internals. Then he replaced the 4L60E with a 4L80E and replaced the transfercase with the HD unit. The single intercooled turbo kit just came on the market at an estimated cost of $6,000. NX setup maybe $500-$800. So between everything i would get under $9,000 on top of the cost of the truck.
I had a 99 Sierra and an 02 sierra and the rear diff. went on both of them. Granted neither truck was stock or driven nicely. But I was nowhere near that power level. If you swap out the internals for the Eaton LSD it will handle the power (for a while)
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