Hello:

The weight transfer starts at the feet. Whether or not you lift your left heel (righties) in the backswing, the first move of the left foot in transition would be to place the weight to the left heel. For those that do lift the left heel in the backswing this is plain to see. They plant the left heel back to ground as they begin to unwind. Since today's swing uses the flat left foot method, you can't really see it but the action is the same. Weight to the left heel like you were crushing an aluminum can with the heel. Of course this will only work if you have transfered your weight to the right side in the backswing correctly. It's really ok to let your head move to the right laterally in the backswing to get the weight over and eliminate the reverse pivot.

When you tranfer the weight back to the left side as described above you should also have the sensation of bumping the left hip forward like nudging a car door closed with your hip as if your hands are full. I do not like the term slide because to me, it connotates a more drastic move that can take your weight outside of your left foot which is a problem. It is a transfer of weight to the left foot as you simultaneaously bump and rotate the left hip. All of the weight transfer in the backswing and downswing should never get beyond the outside portion of either foot.

The most important thing to remember is that your head and torso remain slightly behind the ball at impact for short irons and more for the longer clubs especially the driver that is being swept not compressed down. Take a look at stop action photos of pros at impact to see the interesting body shape. Weight is moving foward in the feet, legs and mid torso but the upper torso and head are always behind the ball. This is a dynamic position but crucial to solid ball striking. Proper weight transfer and maintaining posture allows this to happen.