This is topic Speedo drive gear? in forum Tech Talk at Northern California Ford Owners  .


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Posted by kkd (Member # 4356) on :
 
I'm running 3.73's and need to know what speedo drive gear to run. My T-5 was opened up and the gear inside has been changed from a 7 to a 6 tooth. So,I'm guessing, would I use a 21 tooth drive gear?
Anyone know by experience or know of the website that has the formula to use to calculate?
I have been told that you measure the circumference of your tire and plug the numbers into a formula and it spits out the speedo drive gear for you.
But, geez it has had to have been done thousands of times by members here.

I am running 3.73's in my 8.8 with 255/40/17 tires in my 1991.
 
Posted by PWR HNGRY 302 (Member # 6000) on :
 
Iam running the same gears in 8.8 with a t5 and i used a 21 tooth speedo gear from 50 resto and i think there is a link if you scroll down a little that tells you about the different speedo gears.
 
Posted by kkd (Member # 4356) on :
 
Thanks a bunch!
 
Posted by PWR HNGRY 302 (Member # 6000) on :
 
No problem.
 
Posted by Hungry Hippo (Member # 537) on :
 
with a 6 tooth drive gear you need an 18t speedo gear
 
Posted by blind (Member # 3052) on :
 
quote:
Originally posted by Hungry Hippo:
with a 6 tooth drive gear you need an 18t speedo gear
.

21t would work if you hadn't changed the drive gear.
 




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