Clicking/Popping noise when stopping? Already replaced LCA bushings, body mounts, rad mounts.

I've had a persistent popping/clicking noise when coming to a stop. I'm lifted with Icon ext. travel C/O's RR w/ CDC, JBA UCA's, All Pro Expo leaf pack. Everything regarding suspension is tight and torqued to spec, which I check every oil change as a part of my routine maintence on the truck. I've been trying to narrow down the cause starting with most obvious and working down.

In the past year, I've replaced:

• LCA assembly
  • Moog LCA bushings, ball joints, LCA arm
• Rad mounts
• Body mounts
  
• Leaf spring bushings
• Swing shackle bushings
• U-joints
• Carrier bearing

I've checked the bed and behind seat storage for anything loose, rattling. Nope.

What else is there to check replace?

• UCA bushings are about 4 years old at this point. They're JBA UCA's with OEM rubber bushings with about 80k miles on them.
• Engine mounts?
• Trans mounts?

I've noticed there is a few mm gap in the LCA mount versus the LCA eyelet/bushing. Is it just slop in the mount causing the clicking/popping? Should I add a shim in there to tighten things up?