I think The Joe Darlington drop brackets were 1-1/2" drop? I have them installed (Yes LOTS to take apart)

If you guys were fabbing up more I would go another 1/2"-1" there is still lots of clearance under the axle with larger tires. With my 3-1/2" lift I still tore many boots, however those mag-tech boots have worked really well for me so far. No tears yet (6 months?) fingers crossed they hold.