Replacement shocks... i am needing to get new front and rear shocks. which are the best ones i can get for quality, and price?

also another question... when i start driving, it seems that my fan goes with the same speed as the rpms. all the time. what could be the problem?

I have read good things about the Bilstein HD shocks. I believe that Bilstein are OEM, but not the HD ones. In regards to the fan matching the RPM's, it sounds like your fan clutch could be on its way out. I had mine go a couple of years ago. It was a design flaw that was corrected later on. Mine does this from time to time, and my replacement was supposed to be the corrected model. Until your fan stays on constantly, I wouldn't worry about it.

this site is providing information about how to maintain the 4 wheelers. try to provide more information about which kind of fuel should be used in the 4 wheelers.
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stella
Car Reviews

It depends on how much you love SUV......depends on what you are running...I have a PCM4less tune on my Envoy and on my tune order sheet I went with 89/91 octane....meaning I use Premium to get the best out of my tune and the voy!! It all depends on how much you want to spend!!