Re: what speedo gear options are there?
Reply #1 –
Here's a link from the old site that has a calcilator to figure it out:
http://tciauto.com/tech_info/speedo_gears.htm
If you scroll down there is a list of AOD gears.
I recently discovered that the AOD speedo drive gear is machined into the output shaft. The AOD will have either a 7 or an 8 tooth drive gear and there is no way to tell without removing the tail shaft housing. If you have a 7 tooth drive gear you need a 20 tooth driven gear, if it's an 8 toother you'll need the 23 tooth gear.
For me, my choices were between a 19 and 21 tooth gear for 3.55's. At $13 each I decided to just order both gears rather than pull the tail housing... I ordered my gears from this site (free shipping):
http://www.transmissioncenter.net/AOD.htm