Truck Forums - 2000 K2500 Vibration

Hello I am new to this site, Just like to say hello to everyone.
Anyways I have a 2000 K2500 that i am at wits end with. I have been having rear brake issues for quite sometime.I have replaced the cylinders, pads,drums adjusters and all hardware. However What seems to happen is When i take the brakes apart and inspect them everything looks good.I will put them together and adjust them out. they will work good for probably 10 miles but then I will start to get major pulsation in the rear brake to the point where the whole truck with shake. THe rear brakes will then squeal and lock towards the end of your stop. It almost feels like something is out of balance because i always feel a slight vibration. I just have the driveshaft balanced and u joints replaced as well. If anyone may have any suggestions they would be greatly appreciated[/align]