They come and go. Aftermarket only, and aftermarket doesnt keep up. Or just buy new gear assemblies at 400/ea!I have heard that the parts to rebuild (syncros) this are on back order....with no est ship date. A friend of mine bought a truck with a bad trans for cheep, when to buy parts.....nightmare started. This was in late sept. I haven't talk to anyone since, but just thought I would say something so you look in to it.