Overdrive relay "Buzzing"???

[bc433@scn.org (Bob McLaughlin)]

Fellow SOL's, I need some advice.  My 71 TR6 overdrive has 
developed a relay buzzing or chattering sound.  Sometimes when
it has completly warmed up, the chattering stops.  The noise
doesn't seem to affect the operation, but I can't bring myself
to operate it making that kind of noise.  The non-overdrive op-
eration is fine as well.  If anyone has had similar experiences,
I'd like to hear your soloution.  Thanks in advance.

Bob McLaughlin
'71 TR-6