2014 STX How do I lower the rear end of my 4X4 to level the ride?

 

Most raise the front to level. Maybe remove the rear block between the axel and the leaf springs.

 

As MORRIS mentioned ... Remove the rear leaf spacers. *Which is what I opted to do on my previous 2009 STX.OR ...

Install lowering spring shakles.
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You don't say how much you want to lower. The blocks are 1 1/4", that's the free way. You can also get lowering shackles, as mentioned. I just dropped the rear by using the shackles, Ford Performance item, made by Ground Force. I used 1 1/2" drop.