I am replacing my 350z unrevised with g35coupe rear springs. Is this gonna make it sit a lot higher? Does anyone have rates or meaurements? Or even pics of this being done. My Z springs have 2reds 1 white dot, my G's have 3red dots. Help or comments appreciated. All of this in comparison with revised springs.

 

Based on the color coding on the G35 coupe rear springs, IIRC they are not from a car with a sport suspension, so spring rate wise they are exactly the same (342lbs) as your oem unrevised rear springs. As far as ride height, I would expect +.5" Their will be no harm in running them, though I doubt you'll be pleased with the rear height gain. IMO, run them until you can source another set of 03/04 unrevised rears.

I take it that something happened to the original oem Z springs?