Russntussn -- Chevy Duty's rubber is still the same ... they tried different companies over the years and finally settled on this one, which has proven to be the best. I just bought and installed mine two months ago.
Wayne -- If you can return that rubber to LMC you should. If you got Chevy Duty's rubber, then THAT'S not the problem, for sure. I can't imagine what's happening ... wish I could actually SEE what's going on.
