In our first video, Rotation is Bad Part 1, we talked about how trying to rotate fast/hard will cause your foot pressure to go to your toes to early in the swing.  This will cause you to come over the top, shank, early extension, etc.  Part 2 details a great drill for getting the sequence properly timed in the transition and early downswing.

Grab any alignment rod and run it through the belt loops on the front of your pants.  Be sure to keep the majority of the rod extending out your trail side, right side for right handed golfers.  You should be able to hit balls without having the shaft of the club contacting the alignment rod.  This will give you a great feeling for slowing/delaying the lower body so that the arms/club and get down in front of your body.