Patent ID: 7736264

Claim:
A transmission comprising: an input member; an output member; a stationary member; first, second, third, and fourth planetary gearsets, each having respective first, second, and third members; said first member of said first planetary gearset being continuously operatively connected to said first member of said second planetary gearset for unitary rotation; said second member of said second planetary gearset being continuously operatively connected to said second member of said third planetary gearset for unitary rotation; said third member of said first planetary gearset being continuously operatively connected to said third member of said fourth planetary gearset for unitary rotation; said first member of said third planetary gearset being continuously operatively connected to said first member of said fourth planetary gearset for unitary rotation; said second member of said first planetary gearset being continuously operatively connected to said input member for unitary rotation; said second member of said third planetary gearset being continuously operatively connected to said output member for unitary rotation; first, second, third, fourth, and fifth torque transmitting devices operative to selectively connect members of said planetary gearsets with said input member, said stationary member, or with other members of said planetary gearsets to provide at least eight forward speed ratios; at least one of said torque transmitting devices including a piston partially defining first and second pressure chambers and being selectively moveable in response to hydraulic pressure in said pressure chambers.