They have this listed under
2005 GTO but I thought the GTO's transmission was a 4L65?
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2005 Pontiac GTO
Subject: 4T65E Whine Noise Park/Neutral - keywords bearing drive sprocket support #PIP3894 - (08/17/2006)
Models: All 2000-2007 Passenger Vehicles with 4T65E Transmission
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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
The vehicle may exhibit a whine Noise P/N, gone when in Drive when not moving.
Recommendation/Instructions:
The suggested diagnosis is to shift to drive, apply brake and raise engine RPM. Noise should diminish (may not go away).
If noise is diminished or eliminated, suspect drive or driven sprocket support bearings, or gear bearing (most common is drive sprocket support bearing).
Visually Inspect Drive Sprocket Support Needle bearing for spalled needle roller.
Replace Drive Sprocket Support item #522 (includes 521/523).
