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:

Vehicle Care
California Proposition
65 WarningInput and Output Speed Sensor Removal Automatic Transmission Unit
Input and Output Speed Sensor RemovalCalloutComponent Name1A/Trans Output Speed Sensor Bolt-M6-x-18-(Qty:-1)2A/Trans Output Speed Sensor Assembly3Input Speed Sensor Bolt M6-x-23-(Qty:-1)4Input Speed Sensor AssemblyNote:Compress the locking tabs on the plug to release it from the case and to avoid da ...