In at least one implementation, a torsion rod preload device, includes a body, a driver and a retainer. The body may have a base adapted to be connected to a vehicle and at least one stop. The driver is carried by the body for movement relative to the body, and is adapted to engage a torsion rod so that movement of the driver relative to the body increases a torsion force within the torsion rod. The retainer is carried by one or both of the body and the driver, and is movable by the driver as the driver moves relative to the body. The retainer is engageable with the stop to inhibit or prevent movement of the driver when the retainer is engaged with the stop to maintain a desired torsion force in the torsion rod.