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I'm not a fan of body lifts, I'd rather get the chassis up higher.
To do a 4" lift you will also need brake bias valve spacer and extended/adjustable drag link. Rear lower control arms will hang down a bit with the bigger lift and would be better replaced with heavy duty arms. If you get extended H/D lower control arms you might do away with the need for transmission spacers.
As far as front tyres scrubbing on the backs of the gaurds, the design of most drop arms and drop boxes factor this in and move the diff forward about half an inch.