After doing a little research I found a vendor that supplies everything you need to install performance 3.73 gears (BW 9 bolt -Series 3 carrier) at a reasonable price. The link below will take you there. Gears are $190.00 - thanks to Randy's Ring & Pinion for making these more affordable. I purchased the gears, install kit and axle bearings and seals for a total of less then $400.00. Once they give you a quote ask if they can do any better on price. Knocked almost another $40.00 off my price.

http://www.ring-pinion.com/home.shtml