I had a 73 CJ5 with the detroit, and trust me, it was a handful on icy roads.
Have a locker in my F250, and no problems at all.
I think the weight of the pickup keeps the engagement and disengagement smooth. In the jeep it was jerky, and jerky is not good on icy roads.

Democracy is not freedom. Democracy is two wolves and a lamb voting on what to eat for lunch. Freedom comes from the recognition of certain rights which may not be taken, not even by a 99% vote.
*Marvin Simkin* L.A. Times (1992)