My buddy put a firm feel in his 70 Cuda it works nice. no issues so far it has been in there for about 3-4 years gets driven on nice days. hope that helps.

2013 Chrysler 300 touring 1974 Dodge Charger SE. 360-727-8.75-3.23 sure grip 1972 Dodge Dart Swinger 1995 Dodge Ram 1500 4x4