Weird noise from under driver/passenger seats

Need some help on this one...I have a 2011 DCLB and was driving to work yesterday morning came to a stop light and once I took off at around 25mph I started to hear a "clicking" and "squeaking" noise that almost sounded similar to a fan blade making contact with something in the engine compartment. The problem is this sound isn't coming from the engine but appears it's coming from underneath the drivers/passengers seat. It's only when I push on the gas and does not happen when the truck is in neutral and when I increase RPM's. I checked the engine compartment, all my fans and belts look fine, I also got under the truck nothing looks out of place but did notice a line of grease sprayed on the undercarriage of the truck exactly on top of the U-joint linkage. Could this be my U-joint going bad or something else? Any thoughts would be greatly appreciated. I've got to try and nail this down today because I can't be without my truck for Monday. Thanks in advance.

 

how many miles on the truck?

 

I've got 150K on it.

 

Could be in the transmission

 

Pop out your glovebox and check the blower motor underneath. Mine sounded like crickets chirping until I replaced it.

 

Does it make noise when a/c and heat are off?

 

Yes, all my A/c and heat are off. It happens when I accelerate worse around 40-50 mph with a small vibration on the back of the truck.

 

Vibration in the rear could be a driveshaft issue, there are a BUNCH of threads on here related to that fix (think it was relatively easy if I remember correctly)

 

That center bearing could be shaking around, maybe the rubber is rotted out

 

I gave my center bearing a wiggle and there is a lot of play in it. Thinking it needs replacing.