This is a first-timer posting with a call for advice. This forum seems to have a good deal of knowledgable people on it, so if you could offer some help, please do!
I just started looking into taking care of my car myself, after getting shafted with ridiculous bills for car service. So, assume I know next to nothing.
My problem:
My 98 Legacy has been vibrating on the highway, ie at speeds over 60, but only intermittently. I can't figure out what causes this. The engine still works, but gets slightly sluggish. The vibration is a deep hum that is significantly louder than normal, and I can feel my car vibrating, and see the rearview mirror shaking.
This has happened twice now, and I'm starting to get concerned. Each time, I've pulled out at the next exit, looked at my car to see any obvious things. I pulled and released the parking break, backed up a bit, and then drove on my merry way with no more problems for 20 miles (the rest of the way to work).
I notice the sound/vibration specifically when going up and over Afton Mountain.
At my last oil change (1000 miles ago) they suggested I replace the differentials and examine the transmission, but they wanted to charge a good deal more money for such service, which, since I'm almost to my 90k anyway, I thought I'd hold out for since it didn't seem pressing.
So, adivce? Like I said, assume I know nothing, such as what exactly my differentials do.
Thanks in advance.
