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Noise When Towing

plinkie

By plinkie
in Ask A GM Technician

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plinkie Enthusiast

plinkie

Posted
Posted

2000 G.M.C. Sierra 5.3 3-73 gears, 110 km. I need some help on this one. When towing with truck cold, no noise at all. Once on the hi way for approx. half hour or more, and I slow down for a city or town, I hear a noise coming from under the dash just below the ashtray and cup holder when accelerating. The noise can not be heard at speeds over 60 kms hour, but when I slow down in a town, you hear the noise when truck is accelerating and switching from 1st, 2nd, and 3rd. Once over 60 km, basically gone. I am towing a 3000 pd boat in 3rd. using t.h. The noise that is coming from behind the firewal??? sounds like someone braking dry leaves or crumpling a newspaper. The noise does not change volume with speed, but does disappear momentarily between shifts. This is a very strange noise, and hard to describe, but doesn't really sound like it is coming from the engine at all. I suspect transmission because of the absence between shifts. but as everything is working well, and I have a large trani cooler installed, I am totally stumped. Please give me your opinion of what could make such a strange noise. Also, you never hear the noise unless towing. Thanks

  • 1 year later...
jlucas Enthusiast

jlucas

Posted
Posted

Did you ever find the source? I have a noise under light throttle while towing that I'm trying to figure out, I'll have to pay better attention to the shift points and see if it goes away during shifts.

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