Squeaking U joint
 

I hear squeaking sound from the rear end of my truck. The frequency of the sound increases with speed which makes me believe it is my rear U joint. But I have replace my U joint just a year ago. I am wondering what else can explain this squeaking.

Could it possibly be the brakes? when you push the brakes does it make the sound change (until you stop of course)

did you replace all of the u joints or just one? could be another u joint

If you replaced the u-joint with one that has a grease fitting, grease it........

Cheap u-joints or good ones installed wrong can go bad in less than a year. Get under there & check.

I had the same problem for over a year, had the ujoints replaced and problem was solved.