Your grip should help you hit the ball on your desired path. The grip is generally categorized in three different classifications. Strong, Weak or Neutral grip. The name of these different grips is based on the position of the hands and how this position will help square the club face prior to impact. Each of these grip positions have a purpose and directly influence the flight of the ball.
The Strong grip is to help with for the Slicer.
The slicer is hitting the ball with the clubface open at impact. The strong grip promotes more hand rotation thus closing or squaring the
clubface before impact. This grip begins with the left hand (for the right handed golfer), your left had is turned to a position where you can see three knuckles at address. Look at the “V” lines on your hands. These lines are formed between the index finger and thumb. The “V” line on both hands should be pointing towards your right shoulder. If you are in this position and still hitting the ball to the right adjust the “V” lines even more right and turn your hand until you see four knuckles on the left hand. Another key to look at if the ball is going right is to lighten the right hand grip pressure. This will also help the rotate and square the clubface.
The Weak grip is for the Hooker.
The hooker is hitting the ball with the clubface closed or pointing left at impact. This golfer needs less hand rotation during the swing. Look at the left hand position, you only want to see one knuckle and have the “V” lines pointing more to the middle of your face or chin. If the ball continues to go left with the weakened grip try taking a little firmer grip with the right hand to lessen the amount of rotation.
The Neutral position is down the middle.
For the neutral position you should see two knuckles on the left hand and have the “V” lines pointing just between your right cheek and right shoulder. I refer to this as the starting grip because from here you will make your grip adjustments to a stronger or weaker position to control you ball flight.
Summary, your grip position will directly affect the rotation of the clubface prior to impact and the curve or lack of curve in your ball flight. If you are slicing the ball, move both hands to the right, strengthening the grip. If you are hooking the ball move both hands more to the left, weakening the grip.
Grip position and pressure are equally important in controlling your direction. If you have been changing your grip position and not seeing the ball flight changes you will need to adjust your grip pressure. If the ball is slicing lighten the left hand pressure at address and make sure you do not readjust it during the swing. The lighter left hand pressure will assist the club in turning more and squaring up before impact. If you are hooking the ball, apply slightly more pressure in the left hand, which will reduce the amount of rotation during the swing.
Remember grip pressure and grip position directly affects ball flight. Change your grip and pressure before tearing your swing apart.