If you get a diff cut down and your ute is not engineer approved yet the whole diff assembley needs to be approved.

To combat this I used a diff out of a Corolla 30-55 series, They are available in 3.8 , 4.1 , 4.3 ratios so it gives you a chance to experiment with what ratio is best and they only cost about $50.00 - $100.00 and replacement axles $20.00

When my coupe is engineered and on the road I will have a borg warner out of a vp commodore cut down. If you want this done a place called classic restoration in perth can do this. Not cheap though.