Anybody have any experience with a Powertrax locker in the front axle of the Ram 1500 ? They say in their sales ad it will work with a part time transfer case, manual hubs, or an axle disconnect. Will it effect on road 2wd performance at all? I saw some info in here on Air lockers being the best, but, will they work at -20 deg. F How does the air locker work when not engaged? like a stock differential? If anyone has any experience in this, your input would be greatly appriciated.