8.25 limited slip, Rebuildable?

Hey All. I need some help on what I have for limited slip in my 8.25 differential since it is slipping. I have 74 Duster that has 8.25 diff rear end that I had newer ring & pinion installed. I bought a 3.55 R&P with limited slip here on FABO in 2008. The numbers from ring gear: 2852943 - 3.55, 3 29 88, RJ2 (R is upside down). The carrier for posi was stamped 08 11 24. Wonder if this is rebuildable limited slip or a suregrip that is not. As I remember it was from Dakota maybe 88 or 89. Lost pictures of gears in computer crash. Thanks for help on identifying this. Have a lead on 8.75, but may need this rebuilt until I can get that firm.