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Discussion Starter · #1 ·
I have a 2003 GMC Sierra 1500 Z71, and after look at the RPO codes I saw that I have the heavy duty suspension. What exactly does that package change about the suspension?

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2017 Silverado LTZ Z71
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Changes absolutely nothing. The Z71 package on those models only adds decals, skid plates, and a bigger air box. the "46mm tuned shocks" are the same as the heavy duty suspension, which is on pretty much all models minus wt and magnetic ride control models
 
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