My brother recently purchased a 68 gt 390 coupe. While working to get road ready i checked for posi rear end and sure enough it's a posi. here's the question, the unit is different than a trak-lok. the clutch pack has 5 ears on the metal pieces instead of 4. Also there's no springs or preload plate where the center block is. anyone know what this unit is called? and if so are the tabs on the metal plates in the clutch pack supposed to have a bend in them?