Clunking noise in steering column

[Lattimer]

I recently installed a new Flaming River tilt column in place of the CPP column I had. I wanted the stainless look, and I really hated the grant horn contact that I had to use on the CPP.

I also installed the Flaming River steering wheel adapter, u joints, and shaft.

It steers great, horn finally works right, and everything.

Only problem is, now I get a clunk if I hit a sharp bump, and it is definitely inside the column. I can feel it in the wheel. All of the steering and suspension parts are new, and the only recent change is the column and associated parts.

Anybody have any ideas what this could be or how to fix it? I have triple checked everything for tightness, and whacking the shaft and u joints with a rubber mallet won't replicate the clunk.