My Ford Pickup Truck is F150 1999.Question:  The positraction in my rear end is the Ford Trac Loc, it has quit working, can it be repaired?Answer:   Positraction Clutches will wear out in the PositractionFord Trac-Loc limited-slip differential failure is usually contributed by the clutches these are small, tend to shatter and break. The clutch retaining clips can also come off and harm carrier bearing cap. Parts are available to overhaul the Trac-Loc positraction.  You can see the Ford Trac Loc we offer on our site.Good reference to article on repair of Ford Track Loc positraction http://www.cartechbooks.com/techtips/differentialsaxlesanddrivetrains/Chevrolet and GM vehicles normally have Gov Loc positractions, these units are not repairable, and we suggest you switch the Gov Loc with our Eaton positraction.