For a 3rd gen, if you wanna keep it like a dd, 3.73's, and I had the TCI shift kit in mine with a 3500 stall converter, also from TCI.

Nothing wrong with 4.10s in a DD, as long as it's not gonna be all highway miles :)

- Justin

They only have up to 3.73, that is the Yukon brand, good gears.

Thanks,

www.9bolt.com

edit
nm the site is gone they used to have everything fro 9bolts new posi's,clutch kits,new/used gears,housings