This one is helical vs a friction pack. I think it needs a little traction to work. At least that's what my googling seemed to point to. On ice it's just uselessI don’t know how the LSD works in the big trucks but on my old Mustang GT with the 8.8”you wanted less friction modifier for less slip. Drag race guys would run no modifier, but this comes with “chatter” with street driving.
For street driving it called for conventional gear lube plus the modifier. With some synthetics you didn’t need the modifier.
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