according to this thread
http://www.foxtbirdcougarforums.com/showthread.php?t=14147&highlight=speedo+gear+4.10
For a 4.10 axle ratio, this is the proper trans speedo gear:
392-STE-17271-D
Manual 8-Tooth 4.10 Ratio / White 23 Speedo Gear $15.95
Has anyone actually tried this? Are there any other issues with such a short ratio, for example problems with the VSS?