I can't speak to why you don't have shaking in the streering wheel. But if it turns out to be the front disc's Tundra's had two sizes of calipers. One takes a 4.7" pad and the other takes a 5.3 in pad. Mind had the smaller pads and the rotors kept warping. (it caused the steering wheel to shake.) I upgraded to the larger caliper and pads and it seems to be better. Also I buy from Toyoya. I am going to take a wild guess if you cant find any other issues and say check your drive line and universal joints.