I had my dealer install the X Factor system on my 09` 3400 along with the wet bolt/shackle kit. So far so good. The junk shackles and hardware they took off were enough for me to say glad I did it. Will they prevent a spring hanger from breaking who knows! Short of having brackets welded on the hangers, which I was told would void my warranty on the frame, I am addressing the issue the best I can at this point. Replaced the GY Marathons with G-614`s also. Shame I had to put all that money into it, but it is what it is!
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