Facts are of course better if you know them as a fact.
The slight difference of ratio, can easilt be attributed to two different person working out the ratio, and one rounds UP while the other rounds DOWN 3.63:1 is in the middle.
As I said I have not taken a 4x4 one apart so could not say for sure, WHICH IS WHAT I SAID.
If I bothered to count the teeth on the input and crown wheel I would do a little math and work it out, but it would work out to an infinte amount of places as crown wheel unlikely to be a multiple of the input EXACTLY so ?
I still am not convinced that the 4x4 will be significantly weaker than the 2wd diff.
tabetha