I have a good used Dana 44 TTB 3rd member. The gears and ARB were done probably about ten years ago. It's only seen light use. I would say the total locked in miles (hubs not ARB) since the install is in the 2-4k miles range. The ARB had lighter than usual use. I would say on average over those ten years it got used once or twice every six months. I made sure to engage and spin the ARB on the street at least once every six months to keep the seals oiled. I can ship this so if you would like a quote send me your zip code.