I have a welded Detroit in my mud truck you can try (it kept getting squirrely on slippery roads and no one wanted a Detroit for a 12 bolt so it got welded) and TCI Dave's truck still has his broken one in it to try. More throttle!
There is a guy at work that has two in his TJ and it's fine, but he has some bastard size Toyo Open Country tires that bounce like basketballs because they're overinflated for the weight. I swear it speeds up when you push in the clutch. I think the rolling resistance of the tires play a huge role in the dynamics of an automatic locker with a manual but I have no proof.
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