The rubber bushing spring perches have been known to rip the bottom off the shock. Lot's of bind there.
That happened to me! I KNEW I wasn't the only one!
I had been running newer (1yr old) standard perches, almost brand spankin new Edelbrock shocks (which are upside down, so the weak point is at the perch), and stock springs. I was out running around back roads with the local car club when I cam over a rise too fast and came down hard. Heard a loud CLANG, which was repeated in miniature every time I went over a bump on the way back. Upon inspection I discovered that the left shock piston rod snapped clean off at the lower mount that bolts into the perch. I was not happy, but at least it gave me a good reason to switch to roller perches.