This is a picture of a BAD brass synchro out of my Doug Nash five speed.
It is the same as the T10. These are less than $20 each new. The ZF are $300 new from Butfoy.
Look at the grooves machined into the inner diameter.
Those are what creates the braking action on the cone of the gear.
These grooves have been slightly polished and as a result have lost their braking action.
You can't even see that right? And you won't either.
You should be able to see AND feel the difference between the brand new one and the used one though.
The grooves on the new one will feel sharp by comparion.
The friction additive in the MTL somehow etches these synchros and returns the braking action/friction applying capabilities to the thing.
As the oil filter commercial says, "pay me now, or pay me later".
About $40 to $50 for the MTL or $5500 to pull it apart and change all of the synchros.
The answer seems obvious to me. Apparently not to others?
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