macattack Posted January 11, 2017 Share Posted January 11, 2017 replacing a back up switch on my 740 allison automatic trans. what i need to know is should the truck be running or not when i thread out the switch on the trans. some say have the engine running so you wont loose any trans fluid. with engine off fluid will spill out. has anybody changed theirs and how much fluid will come out. thanks Quote Link to comment https://www.bigmacktrucks.com/topic/48321-replacing-reverse-switch-fluid-question/ Share on other sites More sharing options...
hatcity Posted January 13, 2017 Share Posted January 13, 2017 sorry it took a while to catch my son to ask. if older, no electronics, yes have engine running. fluid will get pulled up into torque convertor, thus dropping fluid level below switch Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/48321-replacing-reverse-switch-fluid-question/#findComment-358158 Share on other sites More sharing options...
macattack Posted January 13, 2017 Author Share Posted January 13, 2017 thanks for the reply. yes its a 96 no electronics. Quote Link to comment https://www.bigmacktrucks.com/topic/48321-replacing-reverse-switch-fluid-question/#findComment-358243 Share on other sites More sharing options...
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