Ford Motor Company on Friday announced a recall of some Explorers and F-350 Super Duty trucks over safety issues.

Nearly 676,152 Ford Explorers from model years 2013-2017 sold in North America are included in the recall and may experience a seized ball joint that could fracture part of the rear suspension.

Affected vehicles may experience a clunk noise, unusual handling, or a misaligned rear wheel. Fracture of a rear toe link significantly diminishes steering control, increasing the risk of a crash.

Ford says there have been six allegations of injuries related to the issue.

The affected vehicles are located in high-corrosion states or in regions with a combination of cold winter weather with relative high humidity and substantial road salt use.

Vehicles were built at Chicago Assembly Plant between Sept. 4, 2012, and Sept. 30, 2017, and Elabuga Assembly Plant in Russia between Jan. 28, 2013, and July 28, 2017.

Owner notifications will begin the week of Aug. 23. Dealers will inspect the cross-axis ball joint, replace the cross-axis ball joint/knuckle as necessary, and replace the toe links with a revised design part. The Ford reference number for this recall is 21S32.

Ford is also recalling nearly 35,000 2020-2021 Ford F-350 Super Duty vehicles with a 6.7-liter engine and single rear wheel axle for a rear axle housing spring seat interface weld issue.

The vehicles being recalled may experience rear driveline disconnection. Drivers may experience vibration or shaking while traveling at highway speeds and shuddering upon acceleration.

If a driveshaft disconnects, trucks may lose power or the transmission if the parking brake isn’t applied.

Ford says it is not aware of any accidents or injuries related to this condition.

Owner notifications will begin the week of Aug. 16. Dealers will inspect the rear axle to determine if the deformation is present. If the axle is deformed, the axle housing will be replaced. If the axle is not deformed, the dealer will perform a weld repair on the spring seats. The Ford reference number for this recall is 21S31.