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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
the auburn posi differentials are a big improvment over the stock Ford traction lok differential and yes, under heavy acceleration they will lock up and drive both rear tires equally hard. and in normal driving they are nice and quiet too and allow the differential to function like normal going around turns without clicking like a locker differential does. I ran mine for several years and raced with it a lot before I finally changed the rear end out for a spool and it was still locking up OK when I sold the rear to another Ford racer who broke his.