vibration

I've had quite a bit of work done on my 1984 El Camino, a full drive train replacement with LS3, etc. I'm having vibration that begins while driving around 75 MPH and gets fairly substantial at 90, enough that I know better than to go further. The shop has chased the problem and believes it...

Hey all, So I've been noticing a vibration at highway speeds. It's been getting worse and I can feel it thumping through the steering wheel, especially when turning. It felt like the left front area. It's gotten so bad that after my last highway trip I limped home doing 50 mph in a designated...