I just changed my steering rack & pinion and all is well but now every time I go over 20 or 30 mph the yellow brake light comes on, with the yellow traction reduced light, a message saying hill dissent control is suspended, and yellow suspension light comes on

 

You may need to calibrate the steering angle so the truck knows which way it is going in relation to which way the wheels are pointing.

Not too difficult, but you do need a proper diagnostic tool for this.

Let us know how it turns out.

Jeff