Failing to turn the clubhead over through impact can cause you to slice. It also can cause weak shots and wild drives. If this sounds like you, try the drill below to correct this swing flaw.
Assume your normal stance with a driver. But reverse your grip while at address, placing your left hand below your right. Now start making fast aggressive practice swings. You should hear a “whoosh” sound as the club passes by you. Try to make this sound louder every time you swing the club. Do this several times in a row. Follow this with a normal practice swing. Then, step up to the tee and hit some balls.
The cross-handed grip ingrains the feel of making a good release. Try to retain that feeling when you step up to hit with your normal stance and grip.