With 8" of lift and 40's even if everything cleared up front you would rub the front of the rear wheelwell pretty bad. The 4th gens have larger rear wheelwells so it would be less of a problem on a 2010+ truck. I would suggest 10"+ for most 40's.
On my 06 Mega I had the Pure Performance longarm with Topgun 8" springs with 40-13.50-17 Goodyear MTRs.17"x9" KMC(dont recall backspacing).I used the Glassworks fenders and bedsides and finessed the pinch weld with a hammer.Only a slight rub on the lower control arm.Had 4.56 gears 5.13 would have been better.Also large tires and torque=spring wrap,so traction bars are a good idea.
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