There's really not a way to fully correct your truck's suspension geometry when you're using leveling spacers or coilovers. Complete 4" lift kits come with dropped crossmembers and new knuckles that correct your truck's suspension and steering geometry. While throwing off your geometry does theoretically cause extra stress and wear, in practice leveling kits up to 2.75" don't usually effect the suspension or steering components' overall lifespans.