Diff oil fluid smell can be diff pressurising and pushing diff oil out the overflow and it drops onto the exhaust ............ With 3.9 or 4.08 gears the ring gear is a tad more offset and it can fling diff fluid straight at the breather orifice.
I rerouted my diff breather pipe to go into a can I can drain.
Does not take much fluid on the zorst to make a stink.
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