Have the car checked at a wheel alignment shop.
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Shocks and struts are more for the ride not the alignment. Tie rods, ball joints and how the front end is adjusted are the alignment. Jack the front end of the car off the ground. Grab the wheel at the top and bottom and see if it wiggles. If it does, that is the ball joints. Grab the sides and do the same. That is the tie rods, idler arm, pitman arm or drag link on rear wheel drive. Tie rods or the steering rack on front wheel drive. Having someone wiggle the wheel while looking at the steering linkages should let you see which part is worn.
There are a number of things that I know of that can cause this one. First off did you have an alignment done after replacing the tires? I would also suggest checking out your front end ie ball joints, tie rod ends, wheel bearings and so on. Good luck
Replacing the ball joints isn't difficult. if they are the original equipment they are riveted on, both the upper and lower ball joints have 4 rivits each, these need ground off with an angle grinder or chiseled off. once the rivits are removed your new ball joints will come with fasteners to resecure your new ball joints. you will also neet to pry the stearing knuckle off this is most easily done with a ball joint separator, it looks like a tunning fork, note it is easier to remove the stearing knuckle before removing the rivits. most people recommend having your alignment checked after changing any suspension component.
Did you do a wheel alignment? Check tie rods, wheel bearing play, and tire conddition.
If you had to pick, fix your ball joints first. The failure of a ball joint can cause the wheel to collapse. If your tie rod falls off then, you loose steering in one wheel. The 'dead' wheel will track along. You really ought to consider the economics of replacing them all at the same time because replacing either will call for a front end alignment and the failure of either will imperil your and your passenger's lives and the lives of people in the vicinity.
Rear wheel drive have upper ball joints, front wheel drive do not. The strut takes the place of the ball joint.
how do you replace ball joints on a 2000 envoy
"0" play in lower ball joints
Replacing Ball joints Check Related Links Below
I have a 2000 Jimmy and just had to have new ball joints put in yesterday for the same problem and then had an alignment done on it today.