What you mean how bad in the stress department? And he says 500
see if the parts look like they have had the shizz beat out of them- bent, bolt holes stretched, stripped, etc. Sometimes you can kind of tell by how bad the truck was they came off of
and for 500 idk... you could get a full kit with the rearend stuff included for a touch over $1,000
(and unless I'm just not seeing the rearend stuff) with this you'll have to buy at the very least a block kit and depending on the size of the lift you want, some springs