2010 Ford Explorer no reverse all gears drives forward

What is your question?

2010 ford explorer wont go into reverse. will go into drive. drives forward in all gears. back brakes would lock sometimes at stop lights and jerk into drive when given gas. I've changed the fluid and filter. I've changed the range sensor. I've changed rear break pads and have inspected the brake caliper components. I've inspected the gear shifter components.

How long has your 2010 Ford Explorer had this problem?

More than a week