diggin dirt Posted June 13, 2015 Share Posted June 13, 2015 i got this truck a while back with a 12 speed in it. there is a toggle switch on the dash that says lo and direct on it. it works fine, when it is in lo the only gear it will let you use is first. perfect for taking off with a load to save the clutch. but it dont like it when you flip that switch on the move. what am i missing? i dont get on the net very often so i apologize if it takes me a long time to respond. any info would be much appreciated. thanx Quote Link to comment https://www.bigmacktrucks.com/topic/40457-can-you-shift-mack-12-speed-lo-to-direct-on-the-go/ Share on other sites More sharing options...
Baxter Posted June 13, 2015 Share Posted June 13, 2015 Thinking mine says do not use while vehicle is moving. Quote Link to comment https://www.bigmacktrucks.com/topic/40457-can-you-shift-mack-12-speed-lo-to-direct-on-the-go/#findComment-293200 Share on other sites More sharing options...
mrsmackpaul Posted June 13, 2015 Share Posted June 13, 2015 yep as above dont use it while your moving it is only for lifting off in real difficult going real big load on a real big hill or on really rough ground the deep reduction is huge step and you will most likely never need it Paul Quote Link to comment https://www.bigmacktrucks.com/topic/40457-can-you-shift-mack-12-speed-lo-to-direct-on-the-go/#findComment-293208 Share on other sites More sharing options...
TRH Posted June 28, 2015 Share Posted June 28, 2015 The range switch on the dash operates a funky shift arrgt. in the rear cover. Don't try it moving, or you'll be in for a world of hurt and repair bills.Seen the aftermath, it ain't good. Mostly because it's a slow-as-hell-shift and lacks anything but a pneumatic interlock. Quote Link to comment https://www.bigmacktrucks.com/topic/40457-can-you-shift-mack-12-speed-lo-to-direct-on-the-go/#findComment-294888 Share on other sites More sharing options...
Jeremy_Brault Posted November 7, 2015 Share Posted November 7, 2015 Shift mine all the time doesn't seem to bother Quote Link to comment https://www.bigmacktrucks.com/topic/40457-can-you-shift-mack-12-speed-lo-to-direct-on-the-go/#findComment-310409 Share on other sites More sharing options...
Back In Black Pulling Posted November 8, 2015 Share Posted November 8, 2015 Used to drive old r model that had second stick for low range used to shift that all the time on the go, but i guess thats a little different. Quote Link to comment https://www.bigmacktrucks.com/topic/40457-can-you-shift-mack-12-speed-lo-to-direct-on-the-go/#findComment-310461 Share on other sites More sharing options...
m16ty Posted November 8, 2015 Share Posted November 8, 2015 (edited) As has been said above, I had a truck that had a stick instead of a air switch. You could shift it on the go. My latest truck has a air shift but I haven't tried shifting it on the go. I'll heed the advise above. Edited November 8, 2015 by m16ty Quote Link to comment https://www.bigmacktrucks.com/topic/40457-can-you-shift-mack-12-speed-lo-to-direct-on-the-go/#findComment-310465 Share on other sites More sharing options...
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