8. If you are thinking of adding a ProRock 80 to your Jeep, you will most likely have to get your driveshaft modified. There are two pinion yoke options: 1410 and 1480. There is no way to get a smaller U-joint on the ProRock 80 just because of how massive the pinion is. We went with 1410 U-joints. The pinion nut is so big it doesn’t even fit in a 1350-series yoke as shown in the foreground. The front yoke would be used in a typical ProRock 60 while the rear is what went into our ProRock 80.