I think we started making differentials for Superformance (who installed them in Shelby rollers) around 2006. As we have never stamped CSX in anything, maybe Superformance, or Shelby, stamped them. Not sure.
We have repaired many, many differentials from that era in Shelby's (differentials we didn't make). Please send a pic of your differential from below so I can see the axle housings and the axles. Also, we stamp our differentials on the bottom, right beside the drain plug. I can probably tell who made it with a pic from below. Make sure you get the entire differential in the pic.
David
