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Posts posted by Sanhell
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Mine was the speed sensor going out.
Mine was the speed sensor going out.
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High pitched humming under acceleration
in Mack Truck Q & A
Posted · Edited by Sanhell
1999 ch613 with a E7 427 and 9 speed transmission.Loud high pitched humming under acceleration. Gets louder with a load but if i let off the pedal it gets quieter.