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 WarningCrankshaft and Bearing Cleaning and Inspection
Special Tools
EN-45059 Torque Angle Sensor Kit
GE-571-B Dial Gauge
For equivalent regional tools, refer to Special Tools.
Crankshaft End Play, Check
Note: Crankshaft attached with crankshaft bearing caps.
Install the GE-571-B gauge (1).
...
Engine Oil Cooler Housing Removal
Remove the 2 engine oil cooler pipe bolts (1).
Remove the oil cooler pipe (2).
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Remove the 5 engine oil cooler housing bolts (2).
Remove the engine oil cooler housing (1).
Remove the engine oil cooler inlet pi ...
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).
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Note: The 3rd gear blocking ring lugs must be aligned with the
3rd/4th gear synchronizer ass ...