Done a fair bit of research on the problem of these things kicking out of gear, and there are a multitude of potential fixes.
Anaheim gears sells a replacement third gear and synchro, as well as the collar that replaces two snap rings. In talking with anaheim, they say the collar won't fix the problem, it's the gear and synchro. *IMO* if the factory synchro/gear was faulty, the problem would be existant from the factory, and the synchro is the only piece that technically wears, so replacing the synchro would then put it back to "factory", which only lasts for 25+ years.
The other fix out there, is replace the shift forks if the coating is worn. At $50/piece, it's a one time deal for most of us. I've got an '85+ SM465 partially torn down, and the coating is shot on one of the forks. Never run this one, but really don't like finding problems by installing the transmission and testing it.
Most modern transmissions use replaceable fork "pads", including the NV4500. http://quad4x4.com/images/center.end.pads.jpg
Anyone have any idea if the SM465 forks could be machined to take the NV4500 pads? I don't see why the idea in theory wouldn't work, but would have to find pads that would fit first. I have a pad around somewhere from a car transmission, but it's obviously too small in every dimension.
Anaheim gears sells a replacement third gear and synchro, as well as the collar that replaces two snap rings. In talking with anaheim, they say the collar won't fix the problem, it's the gear and synchro. *IMO* if the factory synchro/gear was faulty, the problem would be existant from the factory, and the synchro is the only piece that technically wears, so replacing the synchro would then put it back to "factory", which only lasts for 25+ years.
The other fix out there, is replace the shift forks if the coating is worn. At $50/piece, it's a one time deal for most of us. I've got an '85+ SM465 partially torn down, and the coating is shot on one of the forks. Never run this one, but really don't like finding problems by installing the transmission and testing it.
Most modern transmissions use replaceable fork "pads", including the NV4500. http://quad4x4.com/images/center.end.pads.jpg
Anyone have any idea if the SM465 forks could be machined to take the NV4500 pads? I don't see why the idea in theory wouldn't work, but would have to find pads that would fit first. I have a pad around somewhere from a car transmission, but it's obviously too small in every dimension.
