Wtb a set of factory 3.73 rear gears set
#3
junkyards, pull a parts, etc. LS in either will be hard to find. 4.10 LS will be super hard to find. BUT ... might be a lot cheaper than buying the unit and having it installed. A lot involved in the installation. Easier to just replace the rearend.
#4
8.8 Super (which if that's what he has) could be hard to find in junk yards, since they are still rather new.