Need some help with my 2002 Santa fe. I'm having problem with frontend start to shake like when I get up to 40 miles per hour and road is not smooth its like I hit a pot hole and man it starts to shake!!! This is what i did to fix it with no luck! New tires new struts new rack an pinion , new ball joints, top and bottom , and tie rod ends!!!! No luck it rides nice and then I hit 40 and then shake!! Any ideas