Bad rear differential pinion bearing and race. It was making quite the noise.
2007 Chevrolet Suburban 5.3 litre timing chain and gears. Look closely at the top gear, you will see some teeth missing allowing the timing chain to jump. Timing chain tensioner had broken possibly causing this whole situation.
This is what happens when you ignore that horrible noise. This Ford F150 rear differential was low on gear lube and got super hot, damaging all the internal parts. It got so hot the reluctor ring for the ABS sensor started to come off of the carrier and the ABS sensor melted.
This is what happens to the vital internal parts of an engine when it is run low on oil. The pieces you are looking at are, a connecting rod and piston, or whats left of them.
Time for a new clutch kit. You can see the discolored hot spots on the pressure plate.
Active Fuel Management Roller Lifter. Roller quit turning causing a chirping noise every time the high point of the camshaft went by it.
This is called metal on metal. The brake pad material is completely gone and the steel brake pad backing has ground into the brake rotor.
New brake pad is on the left. Worn out brake pad is on the right.