Explorer Lean... Would "Add-A-Leaf" help?

[sferrojr]

For the past couple of years, the rear end on my '96 Explorer has been sagging and showing that tell-tale Explorer Lean to the left. Ruling out whole new leaf packs due to cost, my next option was to get the springs reconditioned at a local suspension/spring shop. Then I came across the Pro-comp "Add-A-Leaf" kit for just around $50 bucks and I was very intrigued. I know adding a leaf would help the overall sag, but would it have any effect on the lean, or would the truck still be leaning, just an inch or two higher?