I had the same problem on the Valiant. The rear springs were just plain soggy. They were adequate - just barely - driving with just me and/or my sweetie, but anything else and they'd bottom out on a big dip or driveway. The Dart had a set of helpers springs I took off when I put the new ones on, so I added those to the Valiant. Problem solved, it's like a whole new car to drive. I will replace the rear springs later when I get into the Valiant, but it's a very workable fix for as long as I need it. They are similar to these I found on Amazon (the photo in the listing is awful, but I think you'll get the idea). And they are cheap. When I installed mine I just pulled the U-bolts and slid the helpers under the shock plate, flattened it with a bottle jack, and tightened it back up. Easy-peasy.