Front/Rear end Clunk when braking at low speeds

So i installed 5100's with stock coils and set them at 1.75 and added an AAL this last weekend. I installed the AAL today and when i got home i noticed a clunk when i slowed down. I put it in reverse and hit the brake and another clunk, forward and brake is another clunk. I checked all the bolts and everything seemed tight.
Truck is a V6 6 speed Manual


Did a search and some people said LCA's, U bolts might be lose, but mine seem fine.

Any help is appreciated!

 

How many miles are on the truck?

 

138,000

 

my truck did that shit since i bought it, its a auto v6, my 09 4banger manual didnt, i bet its the auto tranny. also HELLA threads on here about this, so its not just you that its happening to, as long as its not like ur getting rear ended, and u double checked your bolts

EDIT: also my truck is lifted with air spings in back, could be increased angle of driveshaft, the two piece driveshaft could have a little bit to do with it

 

Have you replaced your front brake pads? If so how long ago? It MAY be the front calipers shifting and just be a coincidence that you just did the lift.

 

I'm pretty sure they were replaced when i bought the truck.. but ill check out the pads

 

Check your drive shaft u-joints also. 135k is when mine went out.

 

U joints is what i was also thinking. B/C I just replaced the Carrier Bearing not to long ago