Do you have to replace the entire Lowe control arm on a 1997 Lincoln town car Lower ball joint?

No, you do not have to replace the entire lower control arm on a 1997 Lincoln Town Car to replace a lower ball joint. Lower ball joints are typically pressed into the control arm and can be replaced individually. However, if the control arm is severely damaged or rusted, it might be more cost-effective and safer to replace the entire arm. But a bad ball joint alone doesn't necessitate replacing the whole control arm.