A drivetrain protection and management system (DPMS) monitors and determines individual wheel speeds to detect wheel spin and slip conditions on a drive axle. Wheel spin is caused by low surface friction, excessive input torque, lack of inter-axle differential and differential locks, excessive operating temperatures, or poor driving techniques. When wheel spin or slip exceeds a threshold, the DPMS automatically controls input torque to the drive axle by controlling engine or retarder torque. In addition to monitoring wheel speeds, the DPMS monitors other vehicle characteristics such as engine torque/speed, transmission ratio, transmission output speed, vehicle speed, throttle position, for example. The DPMS monitors and stores these vehicle characteristics over time and generates a data output that summarizes a history of vehicle operating conditions. The DPMS can communicate this data output real time during vehicle operation, which can be used by a fleet to maximize vehicle performance.