Frank,
I find that when offroad the wheel will normally slip in the dirt before the detroit slips and if it does it is normally only one click. For all intends and purposes offroad the Detroit works just the same as a manually locked setup.
Even on road it is only on really tight turns that it clicks - on straight stuff I never hear it so I assume that natural bumps in the road etc tend to release the bit of windup in the rear axle. Good highways might be different but at 100kph in a 101 I would never hear it anyway.
I have had mine in for 18 months and covered 12,000km onroad and various offroad conditions and in driving the vehicle you would never know it was there and working away. I have no unusual wear patterns in the back tyres and in mine the rears wear better than the fronts.
Cheers
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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