Ritchie Posted June 26, 2019 Share Posted June 26, 2019 So I have 2004 MR600 roll off dumper with a Allison transmission ,, the truck will go to limp mode whenever it shifts to second gear and won’t accelerate. I changed the input and output speed sensors and the turbine speed sensor but it still behaves the same way ,,, anybody with help on this thanks Quote Link to comment https://www.bigmacktrucks.com/topic/57849-derating-when-shifting-to-second-gear/ Share on other sites More sharing options...
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