I am thoroughly disappointed to have found out recently that my 2005 drw ram 3500 cummins 4x4 needs the front and rear American Axholes fluid changed every 15k miles. This is ridiculous!!! I think all of the Fords I owned required it every 100k miles, and no more than 50k doing heavy towing. At $179. 00 to do it at the Dodge dealer and $125. 00 at a quickie place, this is insane. Is this really required? Anybody run AA 3:73's in a similar truck and get away with going a long time between changes? I run light truck all of the time with no serious plans for towing anytime soon. I do lots of city driving and keep my speed below 70 on the hwy. I live in flatlands too, so what gives?