Question about 1999 GMC Sierra

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Sounds like a burst of Air when changing gears???? and Wurrrrrrr when accelerating???

I got a couple questions. 1st when I am driving, if I accelerate at a decent rate, at about 30 MPH I hear what sounds like a burst of air and can then feel the truck shift into the next gear. Same thing happens if I accelerate quickly at around 57-60 MPH. What is this????

Also, when I first start the truck up and hit the accelerator, there is a loud wurrrrring noise, seems like I can only get it to do it with the truck in gear. If I let off the accelerator it stops, hit the accelerator and it does it. It will do this intermitantly until the truck "warms" up, maybe 2-5 minutes... Any thoughts?

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First thing you need to do rule out vacuum to shifting module make sure there is no leaks you usually can detect by a hissing sound or high pitch whistle check your shifting module on your transmission providing transmission screen and filter has been maintained as for the second part gm powersteering pumps have a tendency to whir if a new belt has been installed until it breaks in

Posted on Sep 13, 2008

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