This is the Traxxas 2085 Digital High-torque Waterproof Steering Servo for the X-Maxx and Maxx trucks (with Maxx mount).
High-Torque Digital Waterproof Steering Servo with Wire Lead and Connector
Speed: 0.17 sec/60° @ 6V
Dimensions: 1.97 x 2.0 x 0.98" (50 x 51.5 x 24.9mm) not including heat sink
Weight: 3.6oz (103g) including heat sink
Replacement Part For
Accessory Part For
Maxx (with Maxx Mount)