Author Topic: thread for speedo gear? (Read 309 times)

gwstang · « **on:** February, 01, 2011, 02:32:15 PM »

Hey guys, I believe I made a thread about putting the 3.50 gears into my '66 stang with the 5.0 HO engine/AOD tranny. I was advised with the wheels that I have plus the 3.50 gears to go with a 20 tooth speedo gear to get the speedometer to approximately be the correct speed. Well, it's still showing about 10 mph too fast. I searched for the original post and could not find it. Any ideas here?

silverblueBP · « **Reply #1 on:** February, 01, 2011, 02:34:36 PM »

This one?

http://www.stangfix.com/testforum2/index.php/topic,6818.msg85147.html#msg85147

gwstang · « **Reply #2 on:** February, 01, 2011, 04:25:31 PM »

That is the one about the new gears. Wonder if I was imagining about asking which speedo gear to use???

AzPete · « **Reply #3 on:** February, 01, 2011, 04:56:55 PM »

http://www.stangfix.com/testforum2/index.php/topic,6954.msg85662.html#msg85662

gwstang · « **Reply #4 on:** February, 02, 2011, 03:04:14 PM »

That's it Pete, thanks. Now I would like to understand why the speedo is still off???????

AzPete · « **Reply #5 on:** February, 02, 2011, 03:09:12 PM »

Because the calculation used is wrong somewhere.....lol

I have always taken the difference in actual speed from a GPS compared to what the speedometer reads plus the gear I had used and walked into a Ford dealer. The one I dealt with in Az. had a selection of gears and could set me up with the one I needed. They never missed. After that, I gave up the calculations........

gwstang · « **Reply #6 on:** February, 02, 2011, 04:44:19 PM »

Good idea on the gps. My wife has one in her car I can grab. Thanks.

AzPete · « **Reply #7 on:** February, 02, 2011, 05:05:29 PM »

I normally take comparison speeds at 30/40/50/60.... but 60 is the one that works best to get a good difference and the proper gear from my experience.