You will need a drive shaft with a slip joint. I see you are in New Braunfels. I am in Fredericksburg and in the trucking business. I have drive shafts made at Drive shafts Unlimited in San Antonio and have used them for years. They are at 105 S. WW White. (210) 333 5050. After you install the transmission, measure from center of the bearing cap on the transmission to the center of the bearing cap on the rear yoke. If you have access to the drive shaft, you can reuse the slip joint if it's still good. If you have the old shaft, shortening it will be very inexpensive.