My truck has had this slight squeak while rolling at low speed for a while. Recently it has gotten worse though. It sounds like two pieces of metal squeaking/scraping together (it's really high-pitched), and then when I coast at speeds above 30 it makes a sort of metal flexing sound. I have not noticed any change in the performance, but I have a feeling this is going to just get worse if it's not fixed. My girlfriend's dad and I tried to figure out what it could be and he came up with a possible bad driveshaft bearing. Does anyone know if the symptoms match the possible cause?

Thanks,

Eric