I wanted to post a song or two that i have been recording and see what you guys think. I know first of all that there is problems with the low end..it sounds good on my moniters but when i put it in my truck it sounds "rumbly".
The drums where tracked on one channel so there is only editing them as a whole. I know there are issues with the pannin of the vox as well. Everything else is interchangeable.
Any tips welcome from panning eq..tell me what sucks..even if the singin does..lol..Thanks ahead, here it is..
http://soundclick.com/circleofmansions
I'm not sure which song you're actually talking about, and I don't wish to go checking all five of them. I checked out the first one, "Seattle", which is probably not the one you're talking about since there are no vocals in it, and very little of "everything else" to be "interchangeable", since it's just doubled/wide guitar, bass(?) and mono drums doing a study of a basic guitar riff. (BTW, you're probably not doing yourself any favors tagging that track on SoundClick as "Acoustic: Acoustic Rock

)
But FWIW, I notice very little super-unusual about the technical mix on that track that should cause the problems you're describing, though there are a few areas for improvement:
First, your right channel is unnecessarily clipping in many locations throughout the song. That could be giving your car speakers some momentary problems at the clips.
Second, you have a fairly prominent bass peak in the 80-100Hz area. This in and of itself is not that alarming, but it sounds like it's a combination of your guitars and bass. Frankly, it's not easy to tell in superficial/recreational listening mode whether there's any bass in there because if it's there it's mostly doubling the guitar line and in turn being masked by it. Either try getting more creative with a bass line for that riff, or try notching out the bass freqs on the guitars to let the bass itself come through (and perhaps tame that 100Hz bump a little.)
Third, you might want to high pass the individual tracks or the mix as your sub-bass roll off is pretty shallow; you still have a significant amount of energy going on down to DC. That mud can mess with smaller speakers with flabby bass response.
Take care of this stuff in mixing, not after mixdown. And frankly, there's nothing I described that can't be handled just fine with native processing and 15 minutes worth of work (except maybe the suggestion of a better bass arrangement.)
G.