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Dear GM MEO,We are working this VIN 1GT129CG6CF148604 with a concern of underneath hard metal noise when 4Low is engaged. The operation is normal and we need to gather information from SI to support our justification to customer. Bulletin #PIP4885D refers to RPO NQG. However, under recommendation/instructions of this bulletin, it also leads us to bulletin #01-04-18-001G for information regarding driveline noises. Consequently, this bulletin does not appear in the Bulletin/Campaign Number search in SI. Please see next slide.Please advice.Thanks,John