With my original SMB springs I had a hard time telling if I was disconnected. I even broke a stud and never knew it for several miles while returning from Death Valley. But after I had the Deaver springs installed, I can tell if it's disconnected and the van seems to wallow more in turns.
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2006 Ford 6.0PSD EB-50/E-PH SMB 4X4 Rock Crawler Trailer