I bought it used, and I was wondering if it is lowered. It loks lower than the 01's. I looked under there and in the back there are shackles with the thing(don't know what it's called, the long metal thing that bends) is going through the top hole. Do stock truck have shackles in the back, and if s, how can I tell is they are aftermarket or not.

Look at the sig pic, it looks level, and the truck only has 18,000 on it so the shocks couldn't be worn out that much.

 

by the looks of the pic in your sig, the rear has been lowered.

Stock shackles have only one set of mounting holes (upper and lower)