They're a very stout diff , the 250hd and 350 versions are FF and the ones to get.
I believe the the lack of aftermarket support has kept it from getting used much but if your going to weld it and keep the current gears I'd not be afraid of it.
I had a buddy with a Bronco that ran FF 10.25 with 35" rice&canes and a 460 and it never had a problem.
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