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Found a possible bulletin on the shifter rattle.
Rattle Noise from Manual Transmission Shifter - (Mar 15, 2016)
Condition:
Some customers may comment that the shifter knob is rattling.
Cause:
This condition may be caused by a loose shifter knob retaining screw.
Correction:
If the shifter knob retaining screw is found to be the cause, the fastener needs to be torqued to proper specifications.
Using a flat-bladed trim tool, detach the transmission control lever boot from the console.
2. Lift the transmission control lever boot to access the shift knob fastener
3. Remove the fastener.
4. Apply thread locker, GM P/N 12345382 (In Canada, use 10953489), to the shift knob fastener and install.
Tighten
Tighten the fastener to 7 Y (62 lb in).
5. Install the transmission control lever boot to the console.
Dont know if this is what your hearing, but thought id at least mention it.
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