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 WarningVehicle Identification Number (VIN)
This legal identifier is in the front corner of the instrument panel, on the
left side of the vehicle. It can be seen through the windshield from outside. The
VIN also appears on the Vehicle Certification and Service Parts labels and certificates
of title and registration.
Engine Identifi ...
Special Tools
Illustration
Tool Number/Description
3-9607433
Transmission Support
DT-586
J-23129
KM-586
Universal Seal Remover
DT-3289-20
J-3289-20
Holding Fixture ...
Input Shaft Support Replacement (Gen 2)
Input Shaft Support Replacement
Callout
Component Name
1
3-5 Reverse and 4-5-6 Clutch Fluid Seals (Qty: 3)
Note:
Discard the fluid seals. They are not reusable.
Refer to 3-5-Reverse an ...