SV-1270TG 
The Savox SV-1270TG Digital High Voltage "Monster Torque" Titanium Gear Servo is built to handle extreme requirements, with a great combination of speed and high torque. It's a fantastic choice for 1/8 applications.

"Plus" series servos feature Soft Start and Sanwa SSR compatibility.
Features:
Super strong, precision made titanium gears provide durability that will survive heavy use.
Ideal for large-scale airplane, 1/8 truck, and Monster Truck applications
The servo that racers desire.
Specifications:
Torque @ 7.4v - 40.0kg/555.5oz-in
Torque @ 8.4v - 45.0kg/624.9oz-in
Speed @ 7.4v - 0.11 sec/60 deg
Speed @ 8.4v - 0.10 sec/60 deg