What Else Should I Replace When Changing My Timing Belt?

1. Why do I have a vibration in my truck? 2. What do I need to replace when changing a Timing Belt? 3. Help! I melted my Shifter Cable on my Ford F150. 4. Why does my battery charging light glow dimly? Toyota. 5. Why does my engine fan blow so loud and fast on my Ford F150? 6. Why do my Tundra Door Locks not work? 7. My Ford F150 shakes like a diesel. Cam Phasers? Yes or no?