The associated B3/T3 (2.40:1 tranny) has a 48T diff gear i think.Hammad Ghuman make a 7075 hard anodised one for it.Good luck finding one though.I know Tower say 49T for the B3 but i think they're wrong,need to ask a B3 owner though.
I doubt you'll get your hands on one though,you need to run slip with the stock diff gear(stating the obvious).You need to run slip anyway in my opinion.