The parts manual indicates there are three different strut dampers for the LH, firm feel, touring and performance. That I get, there are three different parts. And depending on sales codes, the springs could be any one of three. Yet all the springs whether they are firm feel, touring or PHP can fit any of the three set-ups depending on the sales code. So, this leads me to wonder, are they all the same spring rate? Which ones are the firmest or heaviest spring rate? And are they all the same fit? In other words, if I have ZNU sales code springs can I install ZDD sales codes springs to get a higher damping rate? (If thats the way they work?)
"It's finally built the way Dodge should have built it."
SDD suspension FTW. Same as the R/T and the 300m with PHP. Put in Special sway bars front/rear and you'll be good to go. I've always considered the SDD suspension in my 2002 R/T the best for bump compliance but good controlled damping.
Another twist: I've seen claims that the difference in ride height of the 300M Special is not due to anything in the springs (unloaded length or spring rate), but in the location of the spring support on the Special strut. I've seen it argued both ways, but no proof or even evidence either way by anyone on either side of the debate.