Thanks I'm going to try my Mustang gear this weekend if it doesn't work I'll call this co.  Dave

Roger PATC didn't have a 23 tooth gear for my 59 Ford O  nor could he build a reduction adapter. So I'm trying to fit a gear out of a later model Mustang I'll report back if I win this battle   Dave

This may be a dumb question but, does the gear in the trans have to be changed to accommodate the different speedo gear?

Durham Missouri

Thanks Paul just ordered it will give it a try  looks right,

Found this on ebay - 23 teeth, correct type.  make sure the tooth orientation is correct.
371473755411



54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

Thanks that one is for a earlier model  

Try this guy, he's showing a 23 tooth gear.

http://www.ebay.com/itm/23-tooth-speedometer-gear-1956-57-T-Bird-1955-56-Ford-NOS-/222126471335

So earlier I posted that the speedometer was showing faster then I was actually going about 10 mph faster. So I pulled the gear and found it to be a green one with 21 teeth.. This is for a 59 Fairlane with a Ford O .Started looking for a gear with more teeth finding out it would be easier to look for hens teeth. Any ideas I'm pretty sure I can;t be the first with this issue.As always this forum is a wealth of knowledge.Thanks Dave