I have never setup an 8.75" rear. I used a 3.91 pumpkin in my old racer and then sold it and went to an OEM Dana 60 that I got for free!! I never went back and now that I finally got an OTC case spreader, I can build one properly. I suppose the next thing I need to buy is the tools for setting pinion depth, I already have the setup bearings for setting depth and backlash. I also have a home made tool for installing the carrier bearings and recently was given a press.