Took the truck for a short spin around the block earlier.
Didn't even have to give it much gas and
TWO rubber patches
Took it around a corner, broke the tires loose....no problem.
Damn, if you don't have an Eaton, you're missing out
The 4.10s pull really well too 
I'll get some videos, anyone have webspace and wouldn't mind hosting?
Later....
'01 Sierra 4.8 SCSB
4.10, Eaton posi, Nelson tune, 160 t-stat, K&N Intake, Magnaflow catback, Vig 3200, Transgo+billets, 100 NX wet shot