JMK Posted October 18, 2008 Share Posted October 18, 2008 (edited) jmk I have a 1965 b61 with a tryplex trans. The transmition grinds when it is in 5th high but it does not grind in 5th lo or 5th direct. Edited October 18, 2008 by JMK Quote Link to comment https://www.bigmacktrucks.com/topic/4315-tryplex-grinding/ Share on other sites More sharing options...
theakerstwo Posted October 18, 2008 Share Posted October 18, 2008 jmk I have a 1965 b61 with a tryplex trans. The transmition grinds when it is in 5th high but it does not grind in 5th lo or 5th direct. That6 is the over drive gear and it will have a bushing in nther o/d gear on the main shaft. The bushing is worn out and letting the gear ride too far away or too close to the counter shaft gear. Went i worked on macks years ago there was a bushing that could be put in there with some machine worh but if it has been doing it long it will need a gear. The counter shaft has brgs on it but if it was bad it would have a noise in low split also. This this problem could be the rear out put brgt but i dought it. The rear box can be removed with out pulling front box. This some times happens when a trans has been run in O/D too much at low RPM. glenn Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/4315-tryplex-grinding/#findComment-22765 Share on other sites More sharing options...
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