The sad truth about automotive parts is that it's usually the failure of a minor piece that causes costly damage to the systems they support. In your overdrive, for example, a cruddy solenoid O-ring can sabotage your entire drivetrain. When the time comes to work on your overdrive solenoid, be sure to grab an inexpensive O-ring from AutoAnything. All of our overdrive solenoid O-rings are built to meet or exceed OEM specs, and you get free shipping with your order.