Wayne,
All I can offer is my experience with transmissions (all OD).  I have had my 
TR250 tranny rebuilt twice by a known professional and it still occasionally 
jumps out of gear.  The TR6 gearbox was a horror story rebuild with three 
attempts at it till it was OK largely due to inferior replacement parts. It 
still is a little hard to get into 2nd gear. Now the one in the TR4 was 
purchased used, stuck in and works great. It is the best one I have.  The TR3 
(actually another TR4 all synchromesh) one was purchased used torn apart only 
to fine it was in good condition, put back together and works great except 
for a big leak at the OD adapter plate where a new gasket was installed, 
TWICE!  I personally am never going to touch another gearbox unless it is 
flat out broke.
Cheers,
Darrell Floyd
 
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