B2 Brake Clutch
WARNING: This page is about a different car, the 2016 RAM 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The B2 brake clutch is hydraulically applied in park, reverse, neutral, first gear by pressurized fluid against the B2 brake clutch piston. When the B2 brake clutch is applied it locks the P2 planetary gear with the P3 planetary ring gear. The rotation of the sun gear shaft is transmitted as counterclockwise turning effect to the P3 planetary pinion gear as it attempts to rotate the P3 planetary ring gear counterclockwise.