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i bought a trans a few years ago and they told me to yank and reuse my stock speedo gear to get a proper reading and they told me if i had changed rears you can go to a auto dealer and tell them what year+gear ratio and theyll give you the correct speedo gear to give you a correct speedo reading. like- i have a 72 truck with a 373 and theyll give you the corrrect speedo gear.
but if the overall diameter of your tires doesnt equal the original equipment it would be wrong.
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