So your looking to do both front and rear, or just the rear?

How much lift are you wanting?

Do you have the stock steering setup? Drop pitman arm?

Theres lots of options, depending on if you want bolt in, if you have stock steering, or if you want to move the spring hangers around, junkyard springs, name brand springs, and the list goes on.

Biggest factor for front flex will be the stock steering setup. Going with crossover/hysteer in the front will give you better movement of the steering arms and allow you to have more flex in the springs. Too much flex with the stock steering system and you can break steering arms.