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Allison 4000 overdrive or 6H

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Is there a overdrive or 6 High on Allison 4000? I notice that all the other gear have L (low) and H (high). If there is 6H how do you put it in 6H. Someone said that once you're in 6 gear push the mode button but all that does is put it in economy mode. Thanks in advance!

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