RE:Direct drive transmission v/s overdrive transmission
Mike, load weights and terrain are two major factors to consider when deciding whether to spec direct drive or overdrive transmission. If I were specing a truck for line haul, light loads and relatively flat terrain I would certainly consider a Direct drive transmission. If I were specing for all load weights, 48 states, and all terrain types I would spec with an Overdrive transmission. I talk with many Owner Operators that have purchased a used truck with Direct drive tranmissions and run 48 states. Their biggest complaints are pulling hills, pulling away from docks with sloped ramps and they have to do everything right all of the time (including holding their mouth just right) to achieve good fuel mileage. Not knocking Direct drive transmissions at all. Just saying that they need to be used in the proper service duty to benefit from the minor improvement in fuel mileage which is the only benefit I know of.