I have a 67 400 convertible that I have just recently noticed the passenger side is about 1/2" lower than the driver side. Up until this point the car has been level, so the first thing I checked was the rear leaf springs because they are known to crack around the centering pin. I have been unable to find any signs of a crack or the springs being otherwise compromised, and the bushings seem to be in good condition. If anyone has any ideas, or has experienced this and rectified it, the help would be greatly appreciated. I also redid the front suspension and steering 2 winters ago and replaced the coil springs, could any of those components be the cause? It just seems odd that the car would sit a half inch lower just within the past month, than sooner if that were the case.

Also, the previous owner who restored the car put 5-leaf rear springs on the car. I know 67 had mono springs only, but if going with the 4 or 5-leaf setup, doesn't the 400 get 4-leaf springs? If so, could anyone recommend a good brand of HD springs...it has a tendency to bottom out with passengers in the rear. Thanks!!