If the ring and pinion gears don't mesh properly then it's likely gear teeth will begin to chip off. If the pinion gear is chipped you'll need another output shaft, so you'd be best off rebuilding a turbo box and swapping your diff into that.
hmmmmmmmmmmm not what i wanted to hear! but your last comment kind of circled around the point im trying to make, i bought this box thinking it was a turbo box and turns out it isnt so why should i again shell out for another rebuilt box when this is down to the mechanic i bought the box off in the first place