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David, The Z71 pkg will replace the Z85. The Z85 pkg is a stock factory package. It includes your trailer handling blah blah blah. The Z71 package is the Z85 package PLUS skid plates, HD offroad shocks, It may have a couple more things but the mind fails me. I would much rather have the Z71 pkg but it wasn't available with the 3500 DW. I did get the plates, will have to get better shocks when they are needed. Don't really take the dually blastin' across the corn fields anyway. Enjoy your truck.
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