Well the only thing I can suggest which may save you money and give you a stronger rear end is look into the Eaton Package that DriveTrain Direct has $559 includes 31 spline Eaton Posi (Carbon Fiber clutches) 31 spline, 31 spline Superior axles, Axle bearings, seals, and studs.
I am going to do the Eaton Package myself, it is supposed to be one on the better differentials out that is very stronger yet more streetable then a spool.
www.Drivetraindirect.com
1-909-272-0158 M-F 7am-5pm PST