Ericjdecket Posted June 21 Share Posted June 21 I have a rebuilt mack 10 speed (multi speed reverse in a 2000 RD Dump. It’s got less than 200 miles on the rebuilt trans but it continues to trouble shifting between hi and low range as well as now all of a sudden it will randomly pop out of gear in hi range while the stick never moves. (It seems like it goes into neutral range.) even though I don’t touch anything. Is there anything outside the transmission that could be causing or did I a get a shotty rebuild? Can the shifter knob assembly have anything to do with it? Or maybe air line problems. Any suggestions would be greatly appreciated. Quote Link to comment https://www.bigmacktrucks.com/topic/74289-rebuilt-t21010b-can%E2%80%99t-shift/ Share on other sites More sharing options...
Joey Mack Posted June 21 Share Posted June 21 Check to see if the yoke nut came loose. Its 1 5/16", and you can check it with a wrench without having to seperate the u-joint. Torque is 550 ftlb, if i remember correctly.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74289-rebuilt-t21010b-can%E2%80%99t-shift/#findComment-554069 Share on other sites More sharing options...
fjh Posted June 21 Share Posted June 21 Any of the above is possible but as Joey commented check the yoke nut ! Also check the oil for water contamination if the oil cooler fails it will take out the synchro in short order! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74289-rebuilt-t21010b-can%E2%80%99t-shift/#findComment-554072 Share on other sites More sharing options...
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