you can put a whole ra60 axle in.. it is newer.. but im not sure how strong they are.. i would imagion they are.. or yo can put a hilux crown wheel in that will make it alot stronger again they usually ahve 4:11 gearing.. same as ra28 but they are a bit stronger.. alot stronger.. aparently they fit into the housing but i am not sure if you gotta change the uni joint. the diff.s int he celicas are relatively strong.. most of the time it is usually the crown wheel that brakes.