We just moved into a home and I have a huge sweet gum tree in my front yard that appears to need iron. You can see the veins clearly and the leaves are a pale green.It's pretty tall and I dont think I can spray it. How do I get iron to it?

You can spray the leaves you can reach and also put Texas green sand around the drip line. Might want to aerate first and could even apply the sick tree treatment. Be warned, this will probably be routien chore for you. Sweetgums don't like our black soil to begin with and when they hit white rock it's usually all downhill. You don't say where you live so I assume you are in/near Dallas.
Tony M