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Skyjack’s T Series telescopic boom lifts include the SJ 40T and SJ 45T boom lifts. The SJ 40T and SJ 45T boom lifts feature an analog-based control system and relay-based electrical system, while avoiding multiplex control and wiring systems. Using an axle-based four-wheel-drive system, there are no wheel motors or torque hubs to deal with. The axle-based system uses a Detroit Locker differential on the rear oscillating axle and limited slip differential (sometimes known as Posi-trac) on the front axle. The models also have features such as the central grease points at the rear of the turret and direction-sensing controls.