I also worked with Steve Hunt and purchased my DR3 Reverse Park Rack and correct nut from him. He is very knowledgeable and helpful. I was extremely happy to get mine running. I have a video showing normal speed, low speed and when I turn the switch off, you can see the rack run in reverse for half a second which is replicating the park function. Now I need to finish the car so that I can install all of this great old stuff
