we always find a solution to fix the problem…. Mack gear box has 5 speeds in the main box, all of with can be split giving 10 speeds,so 5 in reverse, these cant be split as reverse is selected with the spliter switch.you can start backing up in first then shift to second then third and so on, you really have to know what your doing as they can really move in reverse. heavy haulers can have an auxiliary with another 4, the 12 speed has a second lever that gives another lower reduction only on first though, this can be split giving 12 speeds

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