Front end vibes

I know there’s a million threads about this but haven’t seen anyone with this kinda problem. Ok some background on what’s done to my truck... Bilstien 5100 shocks with ome 887 springs up front and matching shocks and wheelers aal out back. Stock ucas, ecgs bearing done at their shop in Raleigh, method wheels, falken 275/70/17 tires road force balanced then the truck was aligned the same day I got them. So here’s the problem... at any any mph I feel a vibration in the front end almost like hitting the rumble strips on the highway, but it’s not constant. I feel it ever 3 seconds on the dot. So for instance, I feel it, it goes away for 3 seconds then I feel it again. Any ideas guys? It’s been driving me crazy.

 

No matter the speed?

 

Does it go away in 4x4? Because then it’s likely the common ECGS bushing failure

 

At what speed?

 

Do you have hub centric ring spacers?

 

Yes, any speed

Had the ecgs bushing replaced before I even installed the lift kit.

No I do not