AMD 36-volt (6.1-hp@4600 rpm) series motor. Internal 10 spline. Speeds up to 23 mph on 36-volt cars. Works great on 48-volt cars. For maximum performance, safety, and durability, 4 gauge cables (#1247) throughout the car, heavy-duty solenoid, F&R switch and 400+ amp controller upgrade required. Not for use on PowerDrive Plus or IQ. Replaces D392.