Have to agree that the 4A is made to be used b any road conditions. Thats what it was designed to do.
While the info below is not RAM specific and I dint have the manual handy, a recent Popular Mechanics article about AWD and 4wd said this about 4A systems currently available: “If you've got a vehicle that offers two-wheel drive or four-wheel-drive auto, then most of the time you may as well use the 4WD Auto setting. It's fine for dry pavement, so the only advantage of running in 2WD would be some fractional fuel economy benefit—or saving wear on the front-drive system. Meanwhile, 4WD Auto is handy even if it starts raining—your extra traction will be there, on demand, automatically.”
And for another view, theres a 2018 thread on this forum entitled “4WD lock on pavement” where a poster complained about his 2016 4A setting sensitivity (Or the lack of).
Begin copied post:
“The thing about the Auto setting in the 16MY I had was that it was literally useless whenever I thought that I needed 4WD. Just simple things like turning a corner on an icy road or trying to go from a dead stop to as fast as possible in a round about to avoid getting hit.
I really noticed now useless Auto was in the round about scenario in rain. The back tires would spin god knows how many times before the fronts would engage and pull me through the round about. Auto is more like the truck is thinking "Hmmm, the backs are spinning so I guess I might as well engage the fronts now."
End of post.
I’m not sure about if RAM changed anything in the system since 2016...