I gotta agree with Hotshoe on this one. I have built 3 cars now with 4" dropped axles, and its true---you can't even get a floor jack under the axle. Every time you run over a manhole cover, your heart stops for a moment. The 5" drop gives a profile thats way cool. but if you plan on driving this car, I would advise 4" drop as the maximum streetable axle.