diff ratios for aw11

[quantumtools]

hi there can anyone tell me if i can get a 4.1, 4.3 or 4.5 diff to fit the aw11 gearbox (c50 or c52) not sure which.

I need higher numbered diff as I run 15" 205/50/15 or 205/55/14 tyres with a locked diff on the dirt and the car bogs down a i end up losing a placing or two.

I have started to bash the clutch to bring revs up, but it pretty hard on the driveline