I drive a 2003 GMC Sierra quadrasteer option, I'm going to send that most of you don't know what this is but it's basically a very rare option which was offered in 2003 which added a rear steering rack to the truck allowing it to steer with all four wheels. The only problem is general motors discontinued this in 2004 so parts are literally non-existent. the quadrasteer rear ends are usually very reliable and solid except for the one rear position sensor, which are usually the failing point. In my truck position sensor just went and to me a newbie I think that the position sensor should be easy to remake as I feel like it's quite simple. I have uploaded a pdf which shows the troubleshooting for the position sensor code that I have. I think it should show a knock of what position sensor does and if it's possible to remake. The actual center itself is about the size of a palm and has a 4 pin connector. Anyway thanks for your time I hope one of you can bring the task on. There is also a possibility of large-scale manufacturing and reselling.