Replacing rear driveshaft?

Thanks for the help. It turned out the snap rings were missing. Not being familiar with the need for these- I would not have known they were needed. I also had the shaft balanced and now it runs great.

No my truck is a single cab so its a one piece driveshaft, and I replaced both u-joints while I was at it.

My next guess would it be my diff? Maybe like you said. The driveshaft is transmitting the noise coming from my diff. I did have an aftermarket LSD put in the tuck about 4 years ago and havent changed the fluid in it since. And on the cover there are slight signs of a fluid escaping but nothing that looks alarming. But maybe that would be my next best place to look.

Whats your opinion?

And thanks for all of your input

And if it were it be my diff is low on fluid how easy it is to replace the fulid myself. Or would it just be in my best interest to take it to a shop. And finnaly what would something like that cost?

I have a noise and it sounds like it is coming from the back of the truck when you go down the road and let off the gas their it a clicking sould I replace the u joints the that did not help can you help me