The Boeing 777-300ER is the only variant of the 777, which has a Semi-Levered Gear.
From the 777 FCOM (v2 14.20.3 Landing Gear - System Description):
Semi-Levered Gear
[777-300ER]
The semi-levered gear consists of an additional hydraulic actuator that connects the forward end of each main gear truck to the shock strut. During takeoff, the actuator locks to restrict rotation of the main gear truck and allow takeoff rotation about the aft wheel axle, thereby improving airplane performance capability. During landing, the actuator is unlocked to permit rotation of the main gear truck and provide additional damping.