its a 71 mod hasnt got the diff code on the data plate, im pretty sure its the same diff as in my old 74 mod which had a t series diff, the 71mod has a t50 box as well so im assuming itll b the same... so try and find a 4age sprinter diff or the crown diff, anthing else to try? i can change studs etc, no dramas, even if i can just change the crownwheel and pinion