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Bought a ford 9" that needs a rebuild. It was under a 55 chevy and thats what I am putting it back in. Problem is, it has what seems to be a factory 31 spline clutchless posi unit in it with factory 3.55 gears. Did ford make this type of locker?
 

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With both axles out , if you look through the tubes and don't see a "cross shaft" in the diff , you have a Detroit locker or spool. If you see a cross bar , you have clutches or an open.
 
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