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What rpm for 2009 Mack T310 mlr Transmission


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New to this Mack Granite with T310 mlr Transmission. The truck doesn't have a shift pattern diagram in the cab, but after looking it up apparently it has lo/lo, lo, 1, 2 3, 4, 5, 6, 7, 8.

My question is at what rpm do I shift? Another driver told me around 20,000 rpm. Seems a bit much to me. Is that right?


Please help!

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