Jolane,
Yet another way to say all this... If you lower a stock car with springs only, you will use up some of the quoted 3" of travel. If you lower the car 2" then you would have only 1" leftover before the top of the strut tube hits the bumpstop. You can put any damper in the world inside that tube and it will never change that. The most direct way to add more bump travel is to install a shorter damper and shorten the tube accordingly. If you shorten it 1" then, practically speaking, you'll gain 1" of bump travel (setting aside motion ratios for the moment). So now, in this scenario, you have two inches. The T3 gland nut does not address this in ANY way. I don't even see the point of it. If you lower a Z and you expect good handling the strut needs to be shortened. There are a couple of other ways to increase bump travel but they are a bit of a tangent.