Just to play devils advocate. In 4wd auto i would think the transfer case is not engaging most of the time. It will only engage when there is slippage in the rear tires which means no wear and tear on the drive train components on the front. On The flip side if you are constantly flooring it in wet conditions then yes the front end drive line components will engage a lot, and only on launches in dry conditions.Dodge did it to limit liability. theres a lot of reasons to be able to run 2wd, less wear and tear on drive train components, better mileage being the top two. Then there is the fun factor... if you can afford a 100k truck you can afford a few tires....
