I'm running 4.5" on 34's , have 2"bumpstops that came with my kit (RE) with hockey pucks on either side of it for 4" total up front , and it's really trimmed up (flare is also raised).out back I'm using 1" daystar bumpstops and the DPG rear adj.bumpstop with none of the "stacks"(1/2 plates)on it. works well with no rubbing. as a side note though , I have adj. front control arms , and have moved the front axle out 1 and a half inchs so not to rub the firewall (inner fender is gone) when turning at full stuff.