I still have the Monroe in the garage, waste of money.
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If your rear is sagging, the leafs are the ones that need replacement, shocks with coilovers will stiffen the ride more and stress on the shock mounts.
I have 4 Monroe Sensatracs on and I agree it is not a very good shock for an Ex. My Ex is not saggingi n the back, at least not that you can see, but seems to lean a bit further on turns. So I am thinking of replacing the rear shocks with Edelbrocks and see how that goes. If I really like them I'll put them in the front too.
In case you haven't already, replace the sway bar bushings and endlinks both front and rear. I did mine in steps. First I installed the Sensatracs on all 4 wheels. Drove it for a while and replaced the front sway bar bushings and endlinks. The improvement was very noticeable. I then waited for a while to get 4 new tires (Kumoh KL61) and again drove around for a few weeks. The new tires of course made a big difference in the ride quality but I could feel the rear hitting bumps harder than the front. My mechanic told me the rear sway bar bushings were not bad and they felt OK to me but I went ahead and replaced them anyways. And boy, what a difference that made, much more than I expected. The whole car now rides almost like new.
My guess is to get a new car ride I will also have to replace all of the body mounts. But that runs about $800, parts and labor, and the ride is pretty good as it is, so I won't be doing this any time soon.
Sorry for the long story, lol, just wanted to share
PS. BTW, I don't load my car or tow anything and only drive onroad. So, as I understand it, the Edelbrocks may be good for me. If you offroad and/or carry heavy loads or tow they may not be the best shock for you. The Edelbrocks sell for about $85 at Amazon.