Also possible that the diff, with no airflow since it is located within a hull, would be subject to overheating no matter what oil was used. There would not be the dissipation that an external differential would have. A fault like this must have weighed very heavily against the vehicle. If the fault was consistant on all the vehicles, could you imagine a 600 mile roadmove? It would be almost as bad as the LSVWs, with them littering the sides of the highways.
Notable that on something like the LAVs, the diffs are outside the hulls.
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