Is there need for a stronger rear diff on the 4x4? I suppose you can also fit the 7.5" with 3.64 ratio to the 4x4, as the ratio is only slightly different to the 3.62? And with the 7.5" on a 4x4 it should be OK to about 600 bhp, as that is about equal to 400 bhp on a rwd, right?

How much power can the standard 7" rear diff on the 4x4 take anyway?