This Delco Starter motor is on D17 Diesel Tractors prior to Serial Number 37964. The Starter Solenoid is mounted on the Starter motor itself. Our Starter motor is  available with or without the mounted Solenoid. Shown price is with new Solenoid. If you already have a new Solenoid, deduct $60. dollars. Our rebuilt is has one of our high wound Armatures in it which increases the torque value of the unit. Like we say: "It's a Torque Monster"!