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If the Mack part number is not helping you, just look for a ratio adapter with the type of drives you need. I assume that you need a 1 to 1 which should be easy to find. Try ebay, there are always some there. The same part can also be found on many old transmissions as well for speedometer drives. If you find used ones the ratio is usually stamped on the adapter housing. You will need either a square or round drive, and you'll need to know the size of the drive as well. 

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