mackniac Posted June 13, 2012 Share Posted June 13, 2012 Hi !need to have some advise on shifting a Mack 12 speed tranny .many people are saying .1- push clutch2- pull stick on 1st direct3- release clutch4- apply fuel pedal5- push knob on HI6- release fuel pedal7-push clutch8- release clutch9- apply fuel pedal again10- push clutch11- pull out stick from 1st to neutral and push knob back to direct12-release clutch13- push clutch14- push stick in 2nd15-release clutch16- apply fuel pedal again17- repeat process for each gearthen some goes :1- push clutch2- pull stick on 1st direct3- release clutch4- apply fuel pedal5- push knob on HI6- release fuel pedal7- apply fuel pedal again8- push clutch9- pull out stick from 1st to neutral and push knob back to direct10-release clutch11- push clutch12- push stick in 2nd13-release clutch14- apply fuel pedal again15- repeat process for each gearthen some others goes :1- push clutch2- pull stick on 1st direct3- release clutch4- apply fuel pedal5- push knob on HI6- release fuel pedal7-push clutch8- pull out stick from 1st to neutral then in first again9- release clutch10- apply fuel pedal again11- push clutch12- pull out stick from 1st to neutral and push knob back to direct13-release clutch14- push clutch15- push stick in 2nd16-release clutch17- apply fuel pedal again18- repeat process for each gear Quote Makniac , collector and customizer of die-cast model in 1/50th scale Link to comment https://www.bigmacktrucks.com/topic/25649-shifting-process-on-a-mack-12speed/ Share on other sites More sharing options...
leversole Posted June 13, 2012 Share Posted June 13, 2012 Here is everything you need to know!12SpdShifting.pdf Quote Link to comment https://www.bigmacktrucks.com/topic/25649-shifting-process-on-a-mack-12speed/#findComment-123818 Share on other sites More sharing options...
BC Mack Posted June 14, 2012 Share Posted June 14, 2012 Hi Leversoleare these documents "self serve" somewhere on this site??I would like to review the same for 1993 18 speedthanksBC Mack Quote Link to comment https://www.bigmacktrucks.com/topic/25649-shifting-process-on-a-mack-12speed/#findComment-123845 Share on other sites More sharing options...
Lmackattack Posted June 14, 2012 Share Posted June 14, 2012 1st direct,rev out gear,flip to hi,release throttle,let rpm drop and fall into next gear, grab throttle and rev out gear, flip into direct, release throttle, move into 2nd hole...repete.. Quote Link to comment https://www.bigmacktrucks.com/topic/25649-shifting-process-on-a-mack-12speed/#findComment-123853 Share on other sites More sharing options...
leversole Posted June 14, 2012 Share Posted June 14, 2012 Hi Leversoleare these documents "self serve" somewhere on this site??I would like to review the same for 1993 18 speedthanksBC MackThe one I have has no info for an 18 speed... Quote Link to comment https://www.bigmacktrucks.com/topic/25649-shifting-process-on-a-mack-12speed/#findComment-123951 Share on other sites More sharing options...
mackniac Posted June 14, 2012 Author Share Posted June 14, 2012 (edited) thank you to all for the help , it is very appreciated !If I see you in Macungie I'd love to sy thank you in person !!I will wear a Red Manitowoc baselball hat ! and a strong french accent !!! lol Edited June 14, 2012 by mackniac Quote Makniac , collector and customizer of die-cast model in 1/50th scale Link to comment https://www.bigmacktrucks.com/topic/25649-shifting-process-on-a-mack-12speed/#findComment-123959 Share on other sites More sharing options...
BC Mack Posted June 15, 2012 Share Posted June 15, 2012 thanks for the help guys..I found the MH owners manual via wiki and it had enough info on the T2180 to answers all my questions.don't think I'll need all 18 gears to bobtail... but you never know!!BC Mack Quote Link to comment https://www.bigmacktrucks.com/topic/25649-shifting-process-on-a-mack-12speed/#findComment-124036 Share on other sites More sharing options...
spud Posted June 15, 2012 Share Posted June 15, 2012 all 18 bobtail......wtf?......drive it like a 8 speed ...... Quote Link to comment https://www.bigmacktrucks.com/topic/25649-shifting-process-on-a-mack-12speed/#findComment-124078 Share on other sites More sharing options...
BC Mack Posted June 15, 2012 Share Posted June 15, 2012 all 18 bobtail......wtf?......drive it like a 8 speed ......LOL....yeh, I know!!! but every now and again I need to hear the 500hp V8 roar 18 times before I settle into cruise on the freeway... Quote Link to comment https://www.bigmacktrucks.com/topic/25649-shifting-process-on-a-mack-12speed/#findComment-124106 Share on other sites More sharing options...
BakerSmith Posted June 16, 2012 Share Posted June 16, 2012 trannies are some of the easiest to drive. I'm not sure I've driven that particular version, but if it's an 8 speed, you'll have a 4 speed H pattern. What you'll do is put the selector in Low, the run through the gears, 1-4. After reaching 4, put the selector in High and shift back to 1, which now becomes 5. Run through 1-4 again, these now become 5-8. To downshift, reverse the sequence.With this tranny it sounds like you'll have 4 reverse gears too. To back up, select ® on the shifter, then select the appropriate gear. Avoid selecting (N) with the clutch released, you'll have a tough time getting back in gear without shutting the truck down. Quote Link to comment https://www.bigmacktrucks.com/topic/25649-shifting-process-on-a-mack-12speed/#findComment-124148 Share on other sites More sharing options...
spud Posted June 23, 2012 Share Posted June 23, 2012 hehehe.....i confess sir......i do the same........lmao Quote Link to comment https://www.bigmacktrucks.com/topic/25649-shifting-process-on-a-mack-12speed/#findComment-125230 Share on other sites More sharing options...
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