We have a 1981 633 that we are using in Lemons and Lucky Dog racing. We swapped in an E28 rear subframe and then sourced a 3:65 Torsen LSD (from a Z3, I imagine). I would like a straight up trade for a similar ratio clutch-type LSD from an E30. Honestly, I not sure what size case we are talking about. Medium, I suppose?

If your LSD needs rebuilding, that's fine. I may ask that you throw a little cash on top of the deal to help us buy new clutches. But, I am open to offers. Prefer trade to sale.

Just for fun, here's the car during a fuel stop at LuckyDog at Buttonwillow this weekend: