A buddy of mine put a set of the MP springs in his 1970 Challenger . the car seems to sag pretty low considering how many springs are in the pack. he plans to upgrade them with either some rebuilt factory springs or have a set built at Eaton / Detroit spring
I seem to recall Mopar having an issue with the metallurgy and the springs sagging fairly quick after they were installed on peoples cars. I've gotten a HD replacement set from Espo Springs N Things for my RR. Rear end sits up higher than before and all I did was change out the bottom leaf for the original to keep the part numbers on there.
