Have you removed the driveshaft and the transfer case sheild? If not you need to to gain the space needed. I am sure you removed the shield, but ntoeveryones knows the driveshaft has to come out. Here is the installation instructions. Good luck!
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten Tighten the bolts, in the sequence shown, to 20 N·m (15 lb ft).