Tranny speedometer drive gear
Thread Starter
Melting Slicks
Joined: Sep 2004
Posts: 2,655
Likes: 19
Tranny speedometer drive gear
I've got a 68 small block 4 speed car. The original came with a 3.27 rear end ratio. Over the years the differential was replaced with a 3.08 ratio, probably from an automatic car.
Is there a 4 speed speedometer drive gear for the tranny available for a 3.08 ratio?
Is there a 4 speed speedometer drive gear for the tranny available for a 3.08 ratio?
Safety Car
Joined: Oct 2004
Posts: 3,926
Likes: 739
From: Youngstown Ohio
The gear you are refering to is the speedo driven gear that needs to be changed. They are available from Zip Products and other vendors. There is a chart that tells which color gear and the number of teeth for different ratios and tire sizes, perhaps someone has it handy to post. But this link will show you what you need:
http://www.zip-products.com/Zip/dept...1398FA4A318E5C
http://www.zip-products.com/Zip/dept...1398FA4A318E5C
Safety Car
Joined: Oct 2004
Posts: 3,926
Likes: 739
From: Youngstown Ohio
......Then you will have to calculate to get it close. Take out the present one and count the teeth. Each tooth difference is about 3 mph difference. You may have to try a couple replacements to get it right. (Sorry, I don't have the chart to provide the numbers).
Safety Car
Joined: Oct 2004
Posts: 3,926
Likes: 739
From: Youngstown Ohio
