yeah, 4:56's would work real nice with your 4l80e.
go 5 liter hunting then
with the t400 in mine, they rev right up on the freeway though
you'll like your skyjackers, been running mine for 'bout 8 yrs, no sag or probs.
kamloops employees were pretty lucky back in the day, thats where my crew orig came from, same thing, no rust at all, but lots of guvment accessory holes