Sanhell Posted November 6, 2020 Share Posted November 6, 2020 (edited) 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. Edited November 6, 2020 by Sanhell Quote Link to comment https://www.bigmacktrucks.com/topic/64840-high-pitched-humming-under-acceleration/ Share on other sites More sharing options...
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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.
Edited by SanhellLink to comment
https://www.bigmacktrucks.com/topic/64840-high-pitched-humming-under-acceleration/Share on other sites
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