An interference fit between the lower ball joint rubber boot and the steering knuckle may cause the rubber boot to be cut. This would allow entry of water, dirt, salt, or other contaminants, possibly leading to premature wear. Failure from premature wear could lead to separation of the steering knuckle and lower control arm, which would cause the vehicle to drop at the affected corner. Vehicle handling and braking could be compromised, increasing the risk of a crash. Dealers will replace the steering knuckles. The recall began April 8, 2004. The GM recall number is 03044.