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Mack 12 Speed Transmission

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Is there more than one Mack 12 speed? I have the shift pattern for the TRTXL 12 speed


I have seen videos of people shifting with a knob like show below, I thought it was a simple flip switch with Hi-Lo in each gear...are these two the same trasmission? And is there only one style of Mack 12 speed...I know the later trucks had a dash mounted switch for the front compound


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that is the shifter for the trtxl1070, the trtxl107 has an air shift main and a manual shift deep reduction, it will have the one tall shifter with the 4 position air shifter, and shorter shifter with just two positions for low and direct, the air shifter shifts, l-d-n-r the trtxl 1070 is an Overdrive trans with the pattern you have posted above and the trtxl1070B has an air switch on the dash for the deep reduction and only one shifter and shifts as the trtxl1070 above.

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