Dentax or Spirax

[CountlessSmiths@domain.elided]

Hi,

    Dentax was specified for the old style non-moly synchros and cones used 
prior to sometime in 1967. Those rings can be recognized by the step-like 
pattern around the circumference. Spirax was specified for the "later" 
molybdenum synchros and cones. Those synchros have a rounded grainy gray 
coating on them. It's been suggested that both the synchros AND the cones be 
replaced if the tranny is upgraded when it's rebuilt.
    I don't know if there would be any real harm done to the old style 
synchros if you used Spirax. 

Good luck,

Steve Smith

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