Mountune replies to concerns
Unknown. I think that most of the people involved in this moved to different brands and didn't look back.
Hey guys, I recently purchased a used '18 and had been researching springs for a while before-hand planning on Mountune based on positive reviews I'd read on earlier model ST's until I came across this thread. I reached out to them regarding this topic and received immediate responses I thought I'd share with everyone.
RE: Changes by Ford to the rear suspension:
"The info below indicates the original springs have the same part number from Ford. Starting in 2017, Ford changed the rear
top spring bushing but that should have no effect on our spring. We hope this answers your question but let us know if you need more info
RE: Possible issues with Mountune Springs
"We did have a small batch of springs last year that were made to the wrong specs. We've since replaced those for customers and have
not had any QC issues since. We install them every day at our facility and they work great."
I'm a little concerned that the thicker bushing may negate any lowering capability of their springs, but based on these responses I placed my order and will provide pics once received and installed!