I'm not a mechanical so I don't know gear ratio or other things I just know it works and nothing is wrong with it except right side of the frame is bent and it came off an 05 suburban z71. Took it off the suburban in October to put on a Tahoe while the Tahoe was in the shop to be fixed just took off the Tahoe this month so I now it all works. I can not deliver. I have a bad back but I can try to help load. Firm on price I know these are expensive. Serious inquiries only, txt message only please