2000 Mustang GT Noise.

[LordBoaZ]

Piston rod bearing. Drop the pan and replace them all from underneath. Its a bitch of a job but the  only other option would be to pull the engine and replace them.

[guyd37]

Wow, not much rod bearings left.....

[sandman1762000]

Do you wanna sell the car?

[sandman1762000]

It sounds like your getting ready to throw a rod i dont think your heads are blowen

[gamerboi777]

sounds like your motor is bad

[djenviornment]

It sounds like a engine problem u might have blown a head gasket but might need engine work definitely that's a loud knock.