C609T Posted December 29, 2018 Share Posted December 29, 2018 I have a 12 speed transmission that’s get stuck in 1st gear. You can fiddle with it and get it working again but I’m thinking something must be worn causing this problem. Thank-you Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted December 29, 2018 Share Posted December 29, 2018 Sounds like the deep reduction range inter lock is getting stuck Is it air shift for deep reduction or air split for deep reduction? Paul Quote Link to comment Share on other sites More sharing options...
C609T Posted December 29, 2018 Author Share Posted December 29, 2018 Deep reduction is on the dash Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted December 29, 2018 Share Posted December 29, 2018 So it is air shift into deep reduction I would start there I would make sure air is going were its meant to when its meant to I would also make sure the bolt inside lid is still tigh and the air ram is working good and not leaking air Paul Quote Link to comment Share on other sites More sharing options...
david wild Posted December 30, 2018 Share Posted December 30, 2018 Just sounds like another junk Mack trans, Mack should stick to building trucks and not trans. fullers we run till they just up and die, the macks are constantly being fixed, I have not found a 18 Mack that has held up yet, no more fixing just replace with what runs. and I will put with the low power and other things but had enough of exuses from Mack on why they shift hard, whine, growl and vibrate. Quote Link to comment Share on other sites More sharing options...
Freightrain Posted December 30, 2018 Share Posted December 30, 2018 David...I think you're holding back.........tell us how you really feel about Mack transmissions......................;) Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
fjh Posted December 30, 2018 Share Posted December 30, 2018 (edited) 17 hours ago, david wild said: Just sounds like another junk Mack trans, Mack should stick to building trucks and not trans. fullers we run till they just up and die, the macks are constantly being fixed, I have not found a 18 Mack that has held up yet, no more fixing just replace with what runs. and I will put with the low power and other things but had enough of exuses from Mack on why they shift hard, whine, growl and vibrate. Dave I some what agree although, the 12 speed had its place as a dump truck trans with the good selection of reverse gears going for it!As for the 18 sp welllll ! VERY temperamental! and TO expensive to work on! agree on that for sure! Fullers got it all over the the Mack trans for reliability and ease of use! Now they have re engineered the reliability out of the Mack diffs as well they don't hold a candle to the Meritor stuff now! Its truly sad ! Built in obsolescence! Edited December 30, 2018 by fjh Quote Link to comment Share on other sites More sharing options...
ekennedy21 Posted December 30, 2018 Share Posted December 30, 2018 (edited) I believe Meritor makes macks rear ends now.... I think they had them made by john deere before. Edited December 30, 2018 by ekennedy21 Quote Link to comment Share on other sites More sharing options...
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