let it loose Posted June 20, 2016 Share Posted June 20, 2016 My 98 DM 13 speed has been occasionally making noise in 4th/8th gear. It doesn't do it all the time, but a few times a day. It was low on oil, I filled it up, and it was quite for awhile but it keeps making noise. Someone told me there was three locations to check the level on the transmission. Not sure if that was true or not. I only have been checking the big side plug on the passenger side. Any ideas? Quote Link to comment https://www.bigmacktrucks.com/topic/45743-mack-13-speed-noisy-and-oil-check-locations/ Share on other sites More sharing options...
MACKS Posted June 20, 2016 Share Posted June 20, 2016 (edited) There is only one plug to check,make sure your checking from the right one,should be the furthest to the back of trans on passenger side. Edited June 20, 2016 by MACKS 1 Quote Link to comment https://www.bigmacktrucks.com/topic/45743-mack-13-speed-noisy-and-oil-check-locations/#findComment-337250 Share on other sites More sharing options...
jkruss82 Posted June 21, 2016 Share Posted June 21, 2016 What kind of noise is it? You may need a new overdrive gear on the main shaft, especially if the unit ran low on oil for a length of time. Quote Link to comment https://www.bigmacktrucks.com/topic/45743-mack-13-speed-noisy-and-oil-check-locations/#findComment-337301 Share on other sites More sharing options...
let it loose Posted June 22, 2016 Author Share Posted June 22, 2016 The sound is gravely, almost like the splitter is trying to engage. Quote Link to comment https://www.bigmacktrucks.com/topic/45743-mack-13-speed-noisy-and-oil-check-locations/#findComment-337379 Share on other sites More sharing options...
Dirtymilkman Posted June 23, 2016 Share Posted June 23, 2016 If it's air ride, check the ride height. Otherwise check carrier bearings and drive line. You can also do an oil analysis on the tranny. Quote Link to comment https://www.bigmacktrucks.com/topic/45743-mack-13-speed-noisy-and-oil-check-locations/#findComment-337396 Share on other sites More sharing options...
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