stick a 2wd diff in there mate, with the 2wd shafts, a lot lot stronger and does NOT damage the centre vc, as the difference in ratios is tiny. 2wd diff is 7.5", 3.64 cwp, 4x4 diff is 7", 3.62cwp , and the flanges are 108mm 2wd and 100mm 4x4.