My 2005 Tundra w/ 4.7Lt. I changed the water pump, thermostat,hoses, tensioner - anything that I could get to. After I buttoned it up, it started running but check engine light came on. I plugged in my code reader-it said “Crank timing misaligned “ after recovering from the ordeal (I have stage 3 RA) I found that the right alignment of the belt is set the timing mark on harmonic balancer (TDC) must be set to an “ imaginary line“ from the center of the right cam (Driver side)to the center of the crankshaft- WTF was it done like that?? After removing everything for the realignment of the crank (Cams are set to both on “T” - double check this, it’s been 7 years) BUT the crank I’m certain about- straight edge from center of crankshaft to center of right camshaft- that’s where your “0 TDC” mark is set with the tension on. I spent a week bedridden after that ordeal. I’ll be much quicker in 80,000 miles when I change it again.