Well here is the criteria for high low range with us. If it is a diesel use high range unless you are fully loaded and are going very slow, and no rpm above 2000K. Otherwise use high range but watch for excessive torque load on the tranny.<br>If it has a gas engine use low range at all times plowing unless the snow fall is light and fluffy and you are plowing a long drive. At no time exceed 20mph plowing, and not over 45 traveling with a plow over the road, and that means the highway. If I could get a govenor I would.<br>Reason is on the gas jobs they are always loaded. Meaning at least 1-2 tons of sand/salt and an 8-9' blade. That is aalot of weight and the tranny will be the weak link. I let the transfere case take all the heat (literally) heat is what kills trannies, so the lower the heat the longer the tranny life.<br>Then with the diesel engine rpms are key to long engine life, and the trannies usually have a lower stall speed then gas engines so they hook up sooner, so high range is ok, but we keep a close eye on the rpms and use low range when needed.<br>BTW we have only auto trannies now, with standard low range isnt as important, but be carefull the 5 sp used by ford until 97 isnt the heaviest duty piece ever designed.<br>As far as plowing speed, I have never seen any state or local municipality truck ever plowing over 30-35 mph even on the interstate. Just think what would happen if you hit an obstacle at 60 mph. Do you think it will trip NO, but the truck will flip I am sure.<br>If you want to plow at 25 be my guest, but where are you plowing that you can muster that kind of speed? We plow a lot that has a 1 mile entrance drive and as long as I have plowed there I have never topped 20 mph, and that is plenty fast enough to roll the snow way over the curbing.Only open roads should be handled at that speed. No driveway or lots should be plowed at that speed. How long is your stopping distance, eveasive manuvers, or panic braking will be non existent at those speeds. People pull out all the time. <br>That ceratinly is not responsible or professional plowing technices.<br>Dino <p>----------<br> Professional Ice and Snow Management <br>Products:Services:Equipment www.sima.org<p>