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I lowered my '07 some 4 - 5 years back. I added a carbon fiber splitter and side skirts. It became such a problem with the splitter rubbing on driveways entrance and exits and speed bumps I decided to rais it up some. Problem is I did nic measure the original height. Today I raised it and I am at 26&3/4 inches in the front and 28 in the rear. Anyone know what it should be. It is a Z51 so it may differ from a base model.
According to all the literature out there, your numbers seem to be in line for sure. The service manual mesures the Z trim height measurement in the front and D height measurement for the rear.
My manual for a 2006 does not include the measurements from ground to bottom of fender as most of us have done, although I did see a chart with the P and R measurement, although not from my manual, but from a 2009 manual. (attached) The Z51 suspension is FE3, 27.3 & 28.2 so your in the ball park for sure .
My manual also stated that the nominal spring adjustment bolt protrusion from top of spring to top of adjusting nut should be 24mm (a) in the diagram. It is not to exceed nominal by more than + or - 5mm (.20 in)
Ride Height
