Apparently my 93 940 has some sort of a locking rear differential, although you'd never know it from the way it drives on ice. It'll spin out one rear at just about any speed.
Anyway, the question is this: I just changed the fluid that was in it, to Shell Spirax HD 80w90 (what I use). If this is a locker, it shouldn't need any special additives, correct? But I'm not very familiar with that breed of rear axle anyway, so is there something I'm missing?
Or does the 93 940 actually have one of those axles? I thought that was a 960 trait.
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