SuperStock spring tips.

Hey '69, No disrespect. But that diagram makes no sense. When analyzing launch and weight transfer, it should show the mass of the car being lifted by the torque arm created by the front half of the leaf. Getting weight onto the rear tires provides the force needed to generate the friction plus sticktion on the forward direction.

There's a few pages in the back of Fred Puhn's How to make your car handle that cover this well.