We get $500/diff (labor) in the rig (parts extra), including lube. $400/diff for an axle out of the rig, and $300 for a 3rd member.
Warranty (6 mo/6K miles) when using our parts (Yukon), pics of pattern (perfect patterns), complete and thorough job that's done right and doesn't blow up due to install error (although I've redone a lot of gear installs that
had blown up due to other installers doing a crappy job...helps keep me in business
).
At the $500 rate, that's 6.5 hrs labor at $77/hr., and it takes me all of that to do it right and thorough (none of my gear installs have been pictured anyplace blown to pieces, or customers stuck with blown up stuff, so I must be doing something right). Any less and I can't keep the doors open.