Quote:
Originally Posted by Mike Peters
If you have the 4:11 rear end ratio that was used on some trucks, then that would explain the lack of road speed. Most Model A's are comfortable at 40-45 MPH.
In the photo, the speedometer drive to the left is the standard 3.78:1 ratio. The drive on the right is the much slower 4:11.
Look under your truck at the front of the driveshaft where it couples to the transmission and see if you can read any numbers on the speedo drive.
This is all assuming that your truck has never had the speedo drive swapped out, or rear end ratio changed. But if everything is still original, then the ratio on your speedo drive will tell you what rear end ratio you have.
If you do have the 4:11 rear end, you can swap out the ring and pinion with either a 3.78 or 3.54 ratio ring and pinion. Your truck will gallop then.
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My turtle has the 9-34 on it with no extension stenciled anywhere on it. How would I interpret that sequence?
Edit: Never mind. That's a 3.78. It's a 9 tooth pinion and 34 tooth driving gear.