This transmission is a rebuildable core, with 6 stud torque convertor. 2/WD version. This unit is sold as core value only, not intended to be put in a vehicle without being rebuilt. If you have checked prices for assorted hard parts, particularly the transmission case, for a 7.3 Diesel, you will realize this is a good value. Having an extra core, allows you to send this one off to get rebuilt at the rebuilder of your choice while your vehicle is still operational.