OD Speedo numbers

["Mike Lishego" <mikesl@tartan.sapc.edu>]

Hello all,
        I know this is covered from time to time, but there is a numeric
difference between a regular and overdrive speedometer.  Can anyone tell me
what that difference is?  I'm talking about the number on the face of the
unit.
        In a similar vein, can anybody tell me the approximate weight of an
overdrive transmission, without fluid?  Thanks...
"Take time to smell the roadsters."
Michael S. Lishego