Gear cases for the 9-inch come in many different applications. For most of the hot rod and truck market, the nine-plus nodular, sportsman and race cases work great. The sportsman case is Currie’s nodular replacement for the now hard to find stock Ford case. You can easily identify the nodular case by the “N” stamped on the outside. The 9-Plus Currie case has been reinforced with extra material and has an extra rib running down the center. The 9-Plus case is also stamped on the outside for easy identification.