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Trying to find differential gear ratio for 2006 C5500 cab and chassis with LLY Duramax and Allison 1000 5 speed. Have Vin and RPO codes but have not found a way to decode
 

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Trying to find differential gear ratio for 2006 C5500 cab and chassis with LLY Duramax and Allison 1000 5 speed. Have Vin and RPO codes but have not found a way to decode
Using the "Community Search" tab located at the top of your screen can locate a few threads in the Med. Duty section of the forum like this one for example:

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