right, story goes i was owed 2 diffs from the cossie i bough in October last year

, finally got them tonight
one of them is standard but the other one is apprently GRP A, but who constitutes a GRP A diff?
its bigger than a standard one and has a different bolt up system - but apart from that what else?
the chap i got the car from was going to rally it, and he's told me the diff is bomb proof as this is what the diff was going to be for
few pics
maybe JB fletch needs one of these?