Here's how I replaced the front and rear couplers on this Lionel Legacy GP35. (Part 2, front coupler replace is at the 15:20 mark) This is my first attempt at doing this. I started with the rear coupler. I thought I had to remove the motor to drop the truck for access to plugs. It made the work easier, but as you 'll see when I replaced the front coupler, i didn't have to remove the motor...do stuff and learn stuff! Hope you enjoy and ....learn stuff. :-D