I have been trying to find information on the Z71 shocks in the NBS trucks. The Z71 package says the shocks are upgraded to 46mm shocks, but what shocks come on the non-Z71 trucks? Are the shocks in the Z71 decent quality? My mom also has a NBS Silverado, but its not Z71. I can tell a big difference in the shocks, the ride in her truck is bouncy, it does not soak up bumps like mine.