is it a 7.5 inch diff? as said it dose look like a gripper but on mine i had too mod the diff caseing on one side as the 7.5 inch gripper diff is to big by a very small amount to fit in the diff caseing so a small amount has to be ground out to be able to get it in also had to lift the diff in with the crown wheel lose on the diff or there was no way at all it was going in lol then bolt the crown wheel up when its in there as they are very tight fittiing in the diff caseing!