many thanks for the feedback; im going with the 4.10s i already have.
i bought the rings, pinions, and master bearing sets from randys ring
and pinion for roughly $1200 delivered. i bought it for an '01 3500
dually. unless theres some reason why it they wont work in an '01
2500, im going to install them.
http://media.concealedcarryforum.com/smokedog.wmv is the truck in