leveling kit

I have a 2017 Toyota trd sport 4x4 4 door .I put a lift kit on it 2 inches front and 1 inch in rear just wanted level it up a bit .now I have a vibration in the front it feels like I am running over a rumpule strip but not that hard.I had the truck alined . when I go between 25 to 35 mph I can really feel it.when I put truck in 4 wheel drive it stops. Toyota garage said it might be a small gear in axle but they checked it and said it wasn't.they said someone makes a replacement gear to take out the play in axle if that's the problem.Just wondered if anyone has heard or had that problem

 

https://eastcoastgearsupply.com/i-8536125-toyota-8-clamshell-bushing-eliminates-needle-bearing.html

 

did you install the spacer block in rear ,did you install block with high side facing to rear and front shorter end facing forward if install backwards it can cause vibe