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 WarningTorque Lock (Automatic Transmission)
If you are parking on a hill and you do not shift the transmission into P (Park)
properly, the weight of the vehicle may put too much force on the parking pawl in
the transmission. You may find it difficult to pull the shift lever out of P (Park).
This is called “torque lock.” To prevent t ...
Special Tools
Illustration
Tool Number/ Description
CH-24319-B
CH-43631
J-24319-B
J-43631
Ball Joint Remover
CH-50559
Wheel Hub / Bearing Remover / Installer Kit
CH-5 ...
Timing Chain Tensioner Replacement
Timing Chain Tensioner Replacement
Callout
Component Name
Preliminary Procedure
Remove the camshaft timing chain . Refer to Camshaft Timing Chain Replacement.
1
Timing Chain Tensioner Fastener (Q ...