Speedometer gear

[sjfd04]

I need to know what speedo gear to use.  I have an automatic with a 40 tooth speedo gear.  My speedometer reads slow, about 5 mph.  Do I need a 41 tooth or 39 tooth?    In addition, where can I buy one?  I did purchase a gear from The Parts Place but it was the wrong one.


thanks, Tom

[Brian]

Less teeth on the driven gear will make the speedo read faster.  So get a 39 tooth and try that.

[sjfd04]

Well, I tried that, the problem was that the gear I got from the Parts Place was smaller in diameter.  I bought 37 38 and a 39 , all the same diameter just the different tooth count.  My 40 tooth is larger and the other gears will not contact the drive gear in the trans. The parts Place indicated the gears I bought were correct for the ST 300.

[WkillGS]

Sounds like you have the wrong sleeve, or gear holder. They are made to fit a certain range of gears.
There were 2 different ones used on '66 GS. I'd expect '65 to be the same.
pn 1362284 fits 34, 35, 36, 37, 38, and 39 tooth gears.
pn 1362285 fits 40, 41, 42, 43, 44, and 45 tooth gears. 
For drive gears, a 16 or 17 tooth gear was used.

[sjfd04]

Thanks for the info, I found what I need on Ebay.

Tom