Heres what you do buy the gears and the install kit nad research and learn how to do it yourself, rear end gears arent that hard. The first thing i ever did was swap and automatic tranny for a stock in a 89 240sx i have no auto experience except autos 1 in high school lol, just research and anything is possible.

BTW i still havent taken any auto classes and i just did a supra engine swap with 1 friend, research and save yourself money.