Hi, when you say that the starter doesnt engage, do you mean it makes no sound at all? Or a click? Let me know and i will try to help you out. Thanks Eric
Here is the procedure for replacing the starter. Pretty straight forward.
Starter Replacement (4.8L, 5.3L, 6.0L) Removal Procedure
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.
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 nut to 16 N·m (12 lb in).
Tighten Tighten the bolts to 50 N·m (37 lb ft).
Tighten Tighten the nut to 90 N·m (67 lb ft).
Tighten Tighten the bolts to 17 N·m (13 lb ft).
Let me know if i can help you further. Please click on accept. Thanks Eric