Patent ID: 8167755

Claim:
A six-speed transmission, comprising: a first gearset including first and second planetary gearsets each having a number of teeth; a second gearset including a third planetary gearset operably associated with the first and second planetary gearsets, the third planetary gearset having an equal number of teeth with respect to one of the first and second planetary gearsets; a first plurality of shift elements operably associated with the first and second planetary gearsets, each of the first plurality of shift elements being movable between a released state and an applied state to selectively engage at least one of the first and second planetary gearsets; a second plurality of shift elements operably associated with the third planetary gearset, each of the second plurality of shift elements being movable between a released state and an applied state to selectively engage the third planetary gearset; a controller operably associated with the first plurality of shift elements and the second plurality of shift elements to selectively engage the first, second and third planetary gearsets; a pump operably associated with the controller; a plurality of lines communicated from the pump to the first plurality of shift elements and the second plurality of shift elements; and a blocker valve associated with at least one of the lines communicated from the pump to at least one of the second plurality of shift elements, the blocker valve being selectively opened to move at least one of the second plurality of shift elements between the released and applied states to prevent simultaneous inadvertent application of the second plurality of shift elements.