[jeffcoslacker]

Don't everybody get all freaked out! The OD's were designed to be run in the OD position primarily UNLESS operated in rolling, hilly environment at low throttle openings. (i.e. running through 40 mph rolling hills) That constant shifting in and out of OD obviously will ultimately wear parts faster, but is a nusiance more than anything. Throw in a lockup convertor going in and out of lockup threshold at the same time, and you've got a lot of unwanted activity going on. But they are engineered with algorithms that kind of "anticipate" the kind of driving that's happening at any given time, and will operate accordingly (delaying lockup until no-load cruising has been established again, etc) So, don't try to over-think it too much. The only time I ever take mine outta OD is when I go to the in-law's place. They got the aforementioned rolling hills, and if left in OD, she'll upshift in on every downhill, only to have to downshift out almost right away for the next hill. Better to just leave it in one range, keep the torque up for the next hill, and skip all that shifting in that situation. But your OD RPM is just a couple hundred lower than drive, so even if you were to run down the highway in drive, you couldn't really hurt anything, but you would use a lot more gas.