leversole Posted November 16, 2012 Share Posted November 16, 2012 Is there more than one Mack 12 speed? I have the shift pattern for the TRTXL 12 speedI 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 Quote Link to comment https://www.bigmacktrucks.com/topic/28374-mack-12-speed-transmission/ Share on other sites More sharing options...
Superdog Posted November 16, 2012 Share Posted November 16, 2012 there were 2 versions,one had a 2nd stick for deep reduction,the other an air switch on the dash.You split the main gears with the splitter on the knob Quote Link to comment https://www.bigmacktrucks.com/topic/28374-mack-12-speed-transmission/#findComment-146280 Share on other sites More sharing options...
rsb502 Posted November 16, 2012 Share Posted November 16, 2012 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. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/28374-mack-12-speed-transmission/#findComment-146281 Share on other sites More sharing options...
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