Steering wheel shimmy or shake

Hoping you guys can help point me in the right direction

A few weeks ago I had my front driver side wheel bearing, rotors and pads replaced. Right after that I noticed a shake in the steering wheel. I can't feel it anywhere else and there is no noises to be heard. I have taken the hub assembly out and revolted everything. The hub rotates just fine. I have also had my tires rotated and balances twice now with no change. To add to it, yesterday when I hit my brakes fairly hard at 50 mph, the steering wheel did a slight jerk to the right. Nothing major but slight. The steering wheel shimmy is inconsistent. I can be doing 60 one minute and its fine, then the next it is shaking. It shakes at anywhere from 30 mph and up, just not consistently. When I use the brakes, it is smooth as can be, so I don't think I have a rotor problem. I think that slight jerk I mentioned could be a possible bad caliper. I have read that sticking calipers can cause a steering vibration when not braking, but then others say no.

Im at a loss and sorry for the length of this.

Sorry, forgot to mention. My truck is an 06 Prerunner with 74k miles.

 

Any modifications done to it like a lift?

 

Sorry, I knew I was forgetting some things. The only mods are 5100s up front and the Toyota 4 leaf in back. I do have one size larger tires, but have had them for over a year and no issues until now. The new rotors I put on are cross drilled and slotted. Other then that, there isn't anything out of stock.

 

Reminds me of this,

http://www.tacomaworld.com/forum/2nd-gen-tacomas/88077-steering-column-fix.html

 

My truck does have that problem as well and I'll see about doing that fix. But these are two totally different feels. I will try the zip tie.

 

What height do you have the 5100s set to??

I'd probably take a good look at the steering rack bushings first.

 

I have had the 5100s for so long, I don't even remember. I just used tg to level the truck after the rear leaf tsb. I believe they are set at the lowest notch. Just one above stock.

I'm going to take a look at the rack. Is there a good way to tell if part of it has gone bad?