I've used my overdrive as a splitter gear throughout both low range and high range 1st thru 4th with no problems whatsoever. Essential when towing up hills and 2nd is too low and 3rd too high, just nice to have that extra gear to bring the revs down. Have heard many a horror story and fairy tale concerning the the use of the overdrive unit between 1st and second but from daily experience all i can say is it's never done my O/D, gearbox or engine any harm whatsoever.
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