Thanks for all the replys....I'm begining to think it's a bad spring or something...I can still tell looking at it whether the tank is full or empty...it's not that noticeable unless you stare at it and compare with other side, which Im always doin....I appreciate all yalls help...

 

but most shops wont wanna touch that strut with the spacer on it to check if that spring is good or not...any other ideas on how to check if its good or bad ?

 

My '09 is 1/2" low on the drivers side before and after leveling. Not only is the gas tank on the drivers side, much of the transfer case is biased that way as well. I suspect that the difference may grow a little over time due to spring fatigue. I have air springs on the back. If it really bothered me, I could put a little more pressure in the driver's side bag to level it out. I don't because I don't want to put the twist on the frame all of the time.