Troywright68 Posted October 15, 2017 Share Posted October 15, 2017 Hi, I have a 2002 RD 688S in which I installed a 13 speed. The transmission had set up for a few years,I have been using it for about a month. Here is my question; what would make it switch from low to high range while idling in nuetral? Now it doesn't want to go back to low range? Quote Link to comment https://www.bigmacktrucks.com/topic/51394-13-speed-wont-go-to-low-range/ Share on other sites More sharing options...
jkruss82 Posted October 16, 2017 Share Posted October 16, 2017 Sounds like it may need new seals and o-rings if the air lines are all still connected properly. Quote Link to comment https://www.bigmacktrucks.com/topic/51394-13-speed-wont-go-to-low-range/#findComment-382645 Share on other sites More sharing options...
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