MACKTRUCKS4 Posted March 13, 2018 Share Posted March 13, 2018 I have a fuller 8 LL in my tri-axle. When shifting from high to low range, it grinds. At the same time this showed up, when I shift from low low, to low, air feeds back through the shifter. If I move the valve around a little, air stops. I can't find much trouble shooting for the 8 LL on the internet. Any help? Quote Live every day like it's your last, because one of these days, it will be. Link to comment https://www.bigmacktrucks.com/topic/52794-8-ll-from-high-to-low-grinding/ Share on other sites More sharing options...
theakerstwo Posted March 13, 2018 Share Posted March 13, 2018 First find out if the air pressure is staying at about 60 psi.If so and it grinds then remove rear box on the trans and repair.If the pins on the scycho are broken then two things will cause that.One is drive line and U/joint angles and also shifting the hi/low range in reverse. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/52794-8-ll-from-high-to-low-grinding/#findComment-394073 Share on other sites More sharing options...
doubleclutchinweasel Posted March 23, 2018 Share Posted March 23, 2018 The 15 speed Fuller i had in mine started doing the same thing going from HI to LO. Replacing the synchro unit solved it in short order. That unit is a marvel of simplicity. Not big bucks, either. Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/52794-8-ll-from-high-to-low-grinding/#findComment-394898 Share on other sites More sharing options...
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