julisrp Posted January 7, 2014 Share Posted January 7, 2014 Hi there,Whenever I'm driving on high speeds and want to downshift from 5th to 4th I hear a grinding noise, is it me? or the transmission. Here's what I do... I downshift from 8-7-6-5 then it's time to go to lower speeds, then I pull down the little front stick and Immediately I hear this grinding sound, as I continue to switch to 4th gear, it takes a couple of seconds to get quiet.Thank you for your input. Quote Link to comment https://www.bigmacktrucks.com/topic/34140-transmission-making-sound-when-changing-from-high-to-lows18-speed-mack/ Share on other sites More sharing options...
Challenger Posted January 8, 2014 Share Posted January 8, 2014 Sounds like the beginning of Synchronizer failure. The lo side seems to go first, meaning the grinding starts going from Hi to Lo. You can take off in Lo because its in Lo before you start, but when you shift from Hi to Lo the friction material is worn and the gears grind. Quote Link to comment https://www.bigmacktrucks.com/topic/34140-transmission-making-sound-when-changing-from-high-to-lows18-speed-mack/#findComment-225308 Share on other sites More sharing options...
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