" Yes, it's the same on all newer subies, not sure about old school. Very bad positioning. I just cut the cable tie & moved it a little, didn't bother with a bracket for it."
That is a big bit of cable with a lot of copper. I will feel safer with a intermediate support for a free unsupported run that long.
I suspect you are right about the diff itself but I will make up a guard that also protects the exhaust run under the suspension crush point.
The original Aluminium plate I started making for the engine had a hole to access the sump plug. The distance up from the plate meant that it was gonna be protected from a hit. The Subextreme one would too, but it's too close to the support bolts to retain strength so it's back to removeing the plate to change oil ( stuff it!!!)