The Toyota box can be purchased as a kit. The unit is from an 84-87 4X4. It is the same as the F100 with a slightly different mount bracket. I get mine from ABS in Orange CA. abspowerbrake.com. I have not installed one on a AD truck. They have a different frame configuration and I'm not sure about clearances. It probably wouldn't work on an AD with a V8 as there are issues with exhaust clearances with the stock gear box.
Fred
