Damn this thread went south fast...
Well, like everyone else, I like to pay less as possible. But I aslo know that I'd rather pay more for it to be done right. I only asked, because I have no idea what it takes to install a ring and pinion. But if 5~6hr is reasonable to install them right,measure backlash and pinion pre-load and what not, then I'm more then happy to pay for the laber. Because in the end, time it takes me to bring back, and complain that something is not right, and fight it out is just not worth my time really.