Hey y'all, I have a 4" lift with a 1" t-case skidplate drop, running 33" tires. Haven't been on the road with it cause I'm repairing the rear shackle to frame mounts (it's a real rust bucket lol). Thing is, I'm looking into getting new shackles and found some with greasable bolts for 25$ a pair. Thing is, they are boomrangs with 1" lift. My setup is pretty common, so I'd like to know if someone runs them and if youre having vibrations or anything? Any downside to it? Will it decrease MPG so much it's not worth it?