Yah, you pretty much have to split the case to install the speedo gear. You also have to buy all the stuff... shaft, the clips, the seals and the plastic gear. Its sucked when i found out too. Not too hard to do though. Use the right torque specs on the bolts when you put it back together.. And use Anaerobic sealer instead of RTV. Make sure it is perfectly clean before you seal it. Wire brush and then some sort of dryer, like carb cleaner.