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Old 12-05-2015, 11:44 PM   #4
Mike C
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Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,740
Re: Rear Differential Casting Number -- How to Decode??

Not much. If you really want to know what gear ratio your truck came with and what sort if any traction device it has, just change the fluid. Chances are the 50 yr old truck needs a fluid change anyhow.
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