Mrblaine, I'm not sure also. when I called rock jock about this problem, they mention that they recently have a new manufacture that is making their spring .so that might be the case. I'm waiting for their replay back to see if I can get an exchange.
I just ordered some RockJock 9131RH1P (rear springs) from a company named Complete Street Performance. I am installing them later today after they arrive. If there are any abnormalities I’ll let you know, but I suspect if they just started working with a new manufacturer that mine or from an older manufacturer.
