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actually I just had this problem and believe it or not it was the driveshaft u joints. It could also be your catylac converter. Get under the truck and hit the converter with your hand. If you here some rattling noises your converter is shot. Too check your ujoints just give the driveshaft a good wiggle to see if ujoints are shot

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Q: What causes whistling sound under 2001 GMC truck?
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