Yes you can still use your 48" Hi-Lift! What they mean is you won't be able to jack it as high. By raising your truck with add-a-leaves and torsion bar or A-arm lift the jack isn't quite as useful if you use the bumpers or hitch or ARB as a jack point. But by using the sliderz then you won't have a problem. I bought the 60" because I also have a 1972 FJ40 that requires it. Plus if you have to use it as a winch you have two extra feet before you have to reset. However you won't be using that cool hold down bracket!