[Cal Metal]

Paul:

The "dogs" I was referring to in my first post are the same thing that, I think, Coyled is referring to as "detents" on the Tremac, although our terminology differs.

The gears don't technically slide. The gears free wheel on the mainshaft and the splined synchro unit engages the clutch teeth on the free wheeling gear via the brass ring (which slows down the rotating gear) on the gear cone.

People sometimes refer to the brass ring as the synchro. If that is what Colyed is referring to, he is correct, and that is probably not your problem. Technically, the synchro unit is made up of a hub which is splined internally, fitting on to the mainshaft. The outside of the hub is also splined with three provisions for the "dogs" which float via two C springs which press against the dogs from the bottom. A splined slider or clutch hub is fitted over the entire unit, and it is that slider that engages the brass ring and clutch teeth on the gear, thereby mating the synchronizer with the gear to be driven.

The purpose of the dogs or detents is to provide smooth action when engaging a gear by providing a floating action. Without them, engagement would be much more difficult, as some binding would occur. If they are broken, this binding will occur and/or pieces can become jammed in the synchronizer which would prevent a shift.

It will still require a tear down. Use a magnetic pickup to see if you can retreive the broken pieces, if that in fact, is the problem.