theakerstwo Posted July 31, 2019 Share Posted July 31, 2019 I have said all of my working days that a trans will not vibrate unless output shaft was bent or off center some way.I have a CH I have been driving that last DEC started to vibrate in the drive line.I have had drive line balanced and messed with the ride height and u/joint angles plus replace front rear end power divider inter and out cam with new imput shaft with no improvement and had started to get worse.Thrusday the trans which is a 9 speed mack started to slip and not make range shift right a so I pulled it and change to a 18 speed mack.I drove it today and its as smooth as a new car.I guess I never get too old to learn something new. 1 1 Quote glenn akers Link to comment Share on other sites More sharing options...
Mack Technician Posted July 31, 2019 Share Posted July 31, 2019 Failed pocket bearing at union point of main shafts? In my mind that could go elliptical on you. 1 Quote Link to comment Share on other sites More sharing options...
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