Sorry to bring this up again. I have read the all old threads and I feel pretty confident about my knowledge of the difference between an automatic 4x4 system (as used in the explorers) and an AWD system (often using a viscous coupling system as in gen 3 Mountaineers). I had the gen 3 Mountaineer and know how the system worked. It was said to have about 35% torque on fronts and 65 % on rears in normal. When the rears slip and heat the viscous coupling they would lock and give 50%/50%. I also understand the explorer automatic 4x4 system is giving approx. 5% front and 95% rears via an electric clutch. If rears slip, the clutch will engage in increments up to a full lock which gives 50%/50% torque spread. I even read through the patents on this. Where my confusion comes up is that I believe the gen 4 Explorer and the Mountaineer is using the same system (minus the low range on Mountaineer). However Explorers are labeled as 4x4 while the Mountaineers are sold as AWD. I know that the Mountaineer is no longer using a viscous coupling as I do not see a transfer case and I also have the option of locking 4x4 via the info center. This to me tells me that it is the electric version. So I guess I have two possible explanations. 1) Ford is using the AWD description incorrectly on the Mountaineer as it is really automatic 4x4 (unless you call 5%/95% spread AWD) or 2) the Mountaineer is programmed differently to have a higher percentage of torque on the fronts before wheel slip is detected. (in ex. 35%/65%). Anybody out there knows which it is (or if it is something completely different) ? Again sorry for the long post. I just wanted to summarize everything I found out reading the old posts. However I did not find anything about how the same mechanical components can both be 4x4 and AWD dependent on which badge is on the vehicle.