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 WarningMode Control Cam Replacement
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Mode Control Cam Replacement
Callout
Component Name
Preliminary Procedures
Remove the heater and air conditioning control. . Refer to Heater
and Air Conditioning Control Replacement
Remove the instrument panel lower tri ...
Front Differential Carrier Installation (6T40/45/50)
Front Differential Carrier Installation
Callout
Component Name
1
Final Drive Sun Gear
2
Differential Carrier Assembly
3
Front Differential Carrier Bearing Asembly
...
Manual Transmission Shift Lever and Selector Lever Cable Adjustment
Remove the floor console. Refer to
Front Floor Console Replacement.
Lift upward and disengage (do not remove) both cable lock
adjusters (1) to release the internal cable assembly, one for each side.
Block the shift control housing, push the selector lever ( ...