For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

California Proposition 65 WarningInfotainment
Determine which radio the vehicle has and read the following pages to become
familiar with its features.
Warning: Taking your eyes off the road for extended periods could
cause a crash resulting in injury or death to you or others. Do not give extended
attention to infotainment tasks wh ...
Instrument Panel Airbag Arming Status Display Replacement
Instrument Panel Airbag Arming Status Display Replacement
Callout
Component Name
Preliminary Procedure
Remove the heater and air conditioning control. Refer to Heater and Air
Conditioning Control Replacement.
...
Main Shaft Assemble (Gen 2)
Special Tools
3-0207944 Main Shaft Tapered Bearing Insert Tool
For equivalent regional tools, refer to Special Tools.
Install the 4th gear bearing assembly (1).
in!i.l.i-if
Note: The 3rd gear blocking ring lugs must be aligned with the
3rd/4th gear synchronizer ass ...