I put new shocks on the rear of my 2008 Nissan Sentra after doing the struts on the front. Had the Struts on first and the car was quieter because one of the old ones made noise. Thought I'd do the shocks too, very easy a bolt at the top and one at the bottom. Now the car sounds like a old pickup with a loose tailgate. No idea where the noise is coming from. Anyone have a idea or had this happen before?