You've got a worn 3rd-4th gear shift fork.
Sunbeam Specialties has been out of replacements (actually an updated Arrow 
Range part) for several years, and I haven't heard of anyone else who has 
them.
Maybe Grimes, in England?
I'm told that a good machine shop should also be able to build up the worn 
area and re-machine it.
Dick Sanders
Seattle
In a message dated 10/21/1999 8:54:43 AM Pacific Daylight Time, 
dougbilesky(at)home.com writes:
<< When the transmission pops out of third gear, on its own, what kind of 
 trouble is brewing?
 
 This occurs when I am coasting in 3rd on flat ground and downhill.
 
 It does not occur YET when accelerating.
 
 Any thoughts are always appreciated. >>
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