Multi-speed power transmission

A powertrain including a multi-speed transmission comprising:

• an input shaft;
• an output shaft;
• three planetary gearsets each having first, second, and third members;
• seven torque-transmitting mechanisms, which are selectively engaged in combinations of two to establish at least seven forward speed ratios between said input shaft and said output shaft;
• said first member of said first planetary gearset being continuously connected with a ground member, said second member of said first planetary gearset being selectively connected with a first and second of said torque-transmitting mechanisms, and said third member of said first planetary gearset being selectively connectable with a third and fourth of the torque-transmitting mechanisms and also interconnected with said input shaft;
• said first member of said second planetary gearset being selectively connectable with said second torque-transmitting mechanism;
• said second member of said second planetary gearset being selectively connectable with a fifth of said torque-transmitting mechanisms and continuously connected with said first member of said third planetary gearset;
• said third member of said second planetary gearset being continuously connected with said second member of said third planetary gearset and with the output of said transmission;
• said third member of said third planetary gearset being selectively connectable with said fourth torque-transmitting mechanism and with said sixth torque-transmitting mechanism;
• and
• a seventh torque-transmitting mechanism selectively connectable between a transmission housing and said first member of said second planetary gearset and said fifth and sixth torque-transmitting mechanisms also being selectively connectable with said transmission housing.