You slice, you lack power and your impact sounds like a "thud" instead of a "crack."
What to fix:
There are a number of errors that can lead to this kind of poor ball striking, but when you're simultaneously producing slices that fly shorter than usual with a dead sound at impact, you're not releasing the club correctly if at all.
The release of the club through impact is a necessary swing component to:
• Make contact with the ball with a square clubface
• Add power to your swing
• Allow your clubhead to exit the hitting zone on plane
You can see why the release is such an important part of your swing. If you don't square your face, the chances of a slice increase dramatically; if your swing lacks power, you're not going to hit the ball very far; and if your club doesn't exit on plane, you can almost guarantee catching the ball off the heel or the toe.
What to do:
Golfers plagued by a poor ball flight never fully unload their wrists. Instead, they keep them firm and lift the club onto the exit plane by bending their left elbow toward the target, a move known as "chicken winging". Your left arm should bend, but with your elbow pointing toward the ground as your wrists unhinge.
2. Swing your driver with just your right hand on the handle.
This will ingrain the feel of a powerful release. As your hand reaches your right knee on the downswing, begin unhinging your wrist and then really unload it through the hitting zone. (You can actually hit balls with this drill.) Try to bow your right wrist as your hand swings through impact and "throw" your clubhead down the target line. Feel how this aggressive unhinging adds extra speed to your swing and allows your club to remain on plane in your follow-through.
3. Now make swings with both hands on your driver.
Again, make sure to unhinge your wrists fully through impact so that your right wrist is bowed in your follow-through. (Your left wrist should be cupped.) There's nothing shy about a powerful release, so really go after the ball through the hitting zone. If your shots start hooking, it's a sign to add more body turn. When your shots start to fly straighter and farther, your release is definitely improving.