truck shake help

OK so I did a Bilstein/toyatech 3" lift and 17's with 33x12.50 Hercules tires. When I hit about 55 mph I tend to get a lot of shake I had the wheels rebalanced checked that my driveline was aligned anyone else got any suggestions what I need to look at or is this expected with 33's

 

is it a shimmy, or a vibration? I would have your pinion angles checked to make sure the u-joints are all happy.

 

Its a shake for sure i thought it was in my steering wheel but when I look at my son in the back seat I can see him shaking from it lol

 

Do you know the condition of your steering rack bushings? It sounds like something in the steering system. If your tires are balanced, it can be a ball joint, or the rack maybe loose.

 

I am under it checking things it all seems good

 

I am gonna try some rear shims seems to be a common issue