[quote]i plan on getting them for a 69 chevelle and was told that this would help a good launch but are alos good for a daily driver. my right spring sags, and i was gunna buy new springs as well? but do i have to if i get this airlift? and does the airlift replace the shocks or do i have to keep them too?<hr></blockquote>
<a href="http://www.airliftcompany.com/al1000.htm" target="_blank">-AirLift Air Bags-</a>
If the car has a weak spring, I would replace both springs. MOOG has a rear coil spring that becomes stiffer as the car squats. This in addition to the adjustibility of the bags will give you needed traction. Of course, you must retain rear shocks. You need either 50/50's or the most HD you can find for the street.
You will also need a traction device and I would look hard at the arm bushings while you have it all apart.