Question about 1999 Chevrolet Silverado 1500

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I have a 1999 Silverado with 270,000km on it. A while back i noticed that intermittently i would hear a air blow off type noise when truck was shifting gears. A couple of days ago the truck stopped shifting gears when on the throttle, i have to let off the gas completely for it to shift?? I called a local trans shop and he advised that he didnt think the problem was the trans but in fact that the catalytic convertor(s) were possibly plugged. I removed cats and tried driving the truck and no luck. any thoughts?

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It sounds like a weak tranny, when you take the load off, and it shifts.

Posted on Sep 13, 2009

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