Any experience good or bad with clutch fans on your mopar?

I am still waiting to hear if the Mopar performance five-blade viscous drive fan ever really locks up enough to hear that "roar" from the fan. Has anyone experienced that?

My last road trip included freeway driving at over 100 degrees outside ambient temperature and also some long, slow, bumper to bumper traffic in the same temperature range. Although the coolant temperature never exceeded a little past the half-way mark, i never heard the fan really lock-up as I expected it to during that real hot spell driving.

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