Ahhh Rangers with 4.0L good deal. The 5r55S is pretty stout however it's the tune that kills it. I haven't read the articles that you have linked to but hopefully they explain that its a dual motion trans, in other words most auto's something gets released and something gets engaged to shift gears this particular trans to go from 3-4 or 4-5 it engages and releases multiple parts and if that is mistuned in the slightest it will tear itself apart. So be careful who you choose to tune, also there are parts such as deeper pans and bigger coolers to add to the strength of this unit.