yeah, i have a 72 240Z and well, it's not mine, it's my dads, but anyway, he put bigger wheels, i'm not sure what exactly, but they are rubbing in the back, but only when you hit a bump, whan can i do to fix it?/ I've heard of little rubber things that you can put in the springs to stiffin them up a lil bit. I really don't want to replace the suspension or anything major.

when you say your dad got bigger wheels do you mean rims and tires or just tires.. if he got new rins and the offsets were wrong then you might have to get wheel spacers to correct the wheel geometry.. if its just larger tires then you might just have to roll your fender lips a bit so they wont rub... find out where the tire is rubbing agaisnt and let us know...

he got bigger tires as well as different rims. he used 280ZX rims if I am correct. They aren't any wider, but the tire itself is taller. Correct me if I'm wrong, but I don't think it is any wider, I will try to compare the tires tonight If i get a chance.