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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.
Changing the trans oil and filter and using an additive called LUBEGARD would be my first step since every downshift (occurs at all speeds) is causing this.
Next I would clean the throttle body and MAF sensor. If there are no vibration concerns or whine or sing noises when accelerating then I do not suspect slack in the driveline after the transmission to blame for this.
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Hello again Chris here,