Wow... that price is stupid. The job is going to take you atleast 4 hours without a lift and you are charging $45?!?!?!?!?
You must be desperate... every garage I have worked in charges a minimum of $250 labor for tranny removal and reinstallation. Then parts, fluid, and disposal fees on top of that. All you had to do was be cheaper than the next guy you didn't have to rip yourself off. And doing the work that cheap its probably not going to do a good job either...