Can you tell me the difference between these 2 vs 4x4 modes?

2011 RAM 1500
150,000 MILES • V8 • 4WD • AUTOMATIC
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BHAMDOC1973
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  • 2,007 POSTS
A simple explanation please?
Nov 18, 2022 at 12:20 PM
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CARADIODOC
  • CAR REPAIR CONTRIBUTOR
  • 34,308 POSTS
In 4-wheel lock, the front and rear driveshafts are locked together all the time. Avoid that when driving on dry pavement as it puts a lot of stress on the transfer case.

4-wheel auto leaves the two driveshafts unlocked until their speeds differ due to a spinning tire, then they lock up momentarily. You are unlikely to feel the engagement, but it makes going through deep snow a lot of fun.
Nov 18, 2022 at 3:45 PM
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