[6pack] Transmission Issue - Now Rebuild question

[Bruce Simms]

Impressed that Racetorations is sending a guy across the pond to make it
right.   
Okay,  question, when we do a rebuild of major component, trannie,
differential etc.  on our 40 year old cars, do we insist that key parts are
replaced, even if they look okay or are still within book spec.   For
instance,   some rebuilders replace differential crown wheel and pinion as a
matter of course, others not.
Bruce Simms