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Take the shock off. Compress it all the way. It should be hard to compress. If it stays compressed, it is toast. If it rebounds smoothly and evenly to full length, it is good.
Just replaced my rusty crusty OEM shocks with 99k miles on them with $20 Monroe Blues, the old shocks were extremely easy to compress and stayed compressed, the new ones were the complete opposite. Its super easy to replace the shocks on these trucks so when you take a old one off just compare it to the new one and you'll easily see the difference...
On my 04 v10 RWD, I just replaced the Rancho RS5000 with a new set of the same Rancho RS5272 shock as the front end seemed to be a little bouncy. Very disappointed that it is the same with the new Rancho shocks as the old.
Replaced mine at 50k ride was poor and when I removed the right front it fell apart. Went with blistien 4600's. Great ride, remember the steering stabilizer while your at it
The shock that attaches to the drag link on your front end.
As Nicmike stated. I was unaware of the type of Ex that the question referred to, I was just pointing out that while your at it change the stabilizer also, sorry for any confusion although we now know that rwd Ex aren't equipped with one.