the diff itself is different for the 7AT and 6MT. the rear end is the same outer casing, but the flange that bolts to your driveshaft is different. If you wanted to swap those it can be done and I have seen it done before. But you would loose some gear, and as far as putting 4.08's in this rear end, you would NOT be able to put the frontier gears in it. the ring gears are different sizes for 6MT and 7AT (hence why the LSD is completely different)
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