Hey there, I got a 05 Tahoe and recently the front wheels have been wobbling. I can't seem to find the issue except there's what appears to b a slot where washers supposed to be on the bacc of the wheels. I don't think the wheels are factory . They where on it when I bought it. The tires don't seem to be pregnant but I do need new tires. They seem to wobbles at about 30mph on up. Any ideas?