Me thinks that you better buy stock in "Spicer"...as in U-Joints.What size tire are you planning on running?That's alot of lift.....hence alot of mods!But if you are dead set on the amount of lift,I'd go with the shackle flip and 4" lift springs.There is another plan or two.You could use a 1 ton shackle mount(gives about 5" lift),extended rear shackles(Desert Steel..2" lift),pair of "Zero Rates"(1" lift).This should give a nice soft and flexy ride.Mike