AE- it is, but most people just hit the little tow/haul button on your gear shift. According to several different mechanic friends that my husband has talked to, that will still allow you to get into overdrive once you get into high speeds. If you leave it in 3rd, with the tow/haul button on, then you definately won't. You shouldn't go much above 60 though and watch the engine RPM's.