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Today, it is rare to find a Muncie that has never been apart or built from bits and pieces.
Untouched “survivor” Muncies are rare; so are the ones that have correct correlating casting and serial numbers.
This could be an alloy improvement, a casting tool change, or some physical change.Reliable sources to validate information regarding serial and casting numbers will get scarcer as time passes.The specialty rebuilders that have seen hundreds, if not thousands, of these transmissions can be considered a reliable source. I’ve met many of these rebuilders and have had the pleasure to create great friendships with them.The evolution of case design also helps pinpoint the year a case was released.The main case casting number was used for either a specific year or series of years. Some cases may look identical and have a different casting number but have the same GM part number.