The DF03 already includes one set of heavy-duty diff outdrives. For whatever reason, Tamiya has you installing them in the front. Typical off-road setup has the front diff being set a bit tighter than the rear. This means most of the diff stress will be located on the rear diff. I would wager swapping them front to rear would give you a nice durable setup.
The DB01 has the half plastic outdrives both front & rear. We're finding almost everyone that experiences diff trouble is having failures in the rear of the car only. Lots of members here recommend only upgrading the rear diff outdrives on the DB01.
The intial tightness of the front diff keeps them from slipping and melting down
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