I have a 1993 corvette.  The past owner put a 4.09 rear-end in it.
This has thrown the speedometer off.  When the speedometer says 74, the
car is actually going about 64.  I think the fix is to replace the
speedometer drive/driven gear(s).  Can someone confirm what I need to
change to correct my speedometer?  Can someone suggest a place to buy
speedometer gears?

thanks