Put 22" wheels/tires on 2007 GMC Sierra

Your tires need balanced.

Struts

just take the drive shaft out and replace all u-joints (3) and ur center support bearing (1) in all on my 2002 gmc sierra 2wd it was 50 dollars

FRONT END SHIMMY AND SHAKING COULD HAVE A TIRE OUT OF BALANCELOOSE OR WORN WHEEL BEARINGS, WORN OUT BALL JOINTS,WORN OUT TIE ROD ENDS, FRONT END NEED ALIGNMENT.BRAKE ROTOR WORN OUT OR WARPED, MANY THINGS WILL CAUSE FRONT END TO SHAKE SHIMMY.

That is usually caused by warped rotor discs. I know you said you just put on new ones, but has anyone put new tires or removed and replaced wheels on your truck. I have seen in the past, when they overtightin the lug nuts it warps the rotors.

All mechanics I have seen installing wheels have over torqued them.

It could be several different things. If it does it only when applying the brakes I would say that your brakes rotors and drums need to be turned on a brake lathe. Other things to check are the tires either being out of balance or damaged. You may have a bent or damaged wheel. Check your front CV joints and axles. Check front wheel bearings. Check for slack in your pitman and idler arms. Check the ujoints and carrier bearing on your rear driveline.

to eliminate the wheel area youll need to have a place where they balance the tire on the truck.and if it still shakes transmission is questionable

you have warped frt disc rotors replace them and the brake pads!

you have too get special rims made too clear the calipers

I would check with the service manager at the dealer, they may have idea as to what is the cause.