It sounds like your tomatoes lost their cotyledon leaves "nursing leaves." The plants gain nourishment from these leaves until they get their true leaves and drop the cotyledons when they don't need them any longer.

booberry...I should've stated that the leaves that are dropping are not only the cotyledon ones but the true leaves...

That is unusual. I don't know what's causing it. It seems extreme for transplant shock. I'm posting to bring this back to the top. Maybe someone else knows.

booberry...thanks...I called my local nursery and they thought that it was due to salt content as I used year-old potting soil which I kinda suspected...if soil sits too long it can build up salts...she recommended that I wait until the plants are kinda dry and then flush them with water until it runs out the bottom...

If it gets worse she said to transplant again with new soil...