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possible filter plugging, valving or solenoid problems of other internal issues. Take it to your local trany shop and they usually will take it for a test drive at no charge & give you an idea of whats up. If you don't know the shop, take it to a few and get a 2nd, 3rd & 4th opinion. They should be able to give you an idea without ripping it apart. The evil ones will try to talk/pressure you into having it removed and at that point you have no choice but to get them to fix it. Get a FIRM WRITTEN quote before you get work done and check out the shop to make sure they're reliable before the work gets done.

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15y ago
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Q: Why does the transmission of your 2004 GMC Envoy whine?
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