speedometer question

November 19, 2008, 07:44:18 PM

on my '83 cougar i'm wondering what i should do for a speedo/gear, got the factory setup, but i've since swapped in a c4,and a 3.73 rear end, my car had a aod/3.08 stock

speedometer question

Reply #1 – November 20, 2008, 01:49:54 AM

This might interest you,,
caption from an older converstation contained in my diy link above my signature..........

[COLOR="Red"]MISC SPEEDO GEAR INFO
---thunderjet302
For those of you who have installed 3.73 gears with your stock AOD you know how hard
it is to find a speedo driven gear to make your speedo close to accurate. In reality a
24 tooth gear would put it dead on but a 23 tooth gear makes it with in 1-3 mph of being
correct. The only problem was that there was no 23 tooth auto trans driven gear avaliable
from Ford. You either had to use a 21 tooth gear like I did and accept the 6-7 mph
difference between what the speedo said and your actual speed or use a 23 tooth gear
for a T-5 which would wear out fast. There is a solution though. I found a 23 tooth
AOD driven gear at Mustangs unlimited. I ordered it and it looks just like my 21 tooth
gear with 2 more teeth. I installed it and vola my speedo is almost right on. Here's
the link if anyone is interested. ---thunderjet302

--turbocoupe50
Cool... But I have the later super coupe AOD with a 7 tooth output.
A 21 works fine for me.--turbocoupe50[/COLOR]

speedometer question

Reply #2 – November 20, 2008, 03:15:45 PM

Do you know how many teeth are on the speedo drive gear? Is it 7 or 8? I can let you know what gear you need by knowing that information.

I believe the gear you have is a 17 or 18 tooth driven gear. I don't remember which one though