These are the governor pressure solenoid and transducer electronics found in 2003-2007 48RE transmissions.
The governor solenoid is responsible for 1-3 Gear shift operation.
The transducer relays governor pressure / transmission temperature to the PCM.
This is a Borg Warner upgraded solenoid that can handle 15% more pressure than factory.
Included in this kit is the metal style retrofit upgrade to eliminate the chance of premature transducer failure with high pressure valve bodies.