So here's the scoop... last week, my car was running great. Not a single problem with it at all. I had to get my car inspected the other day, and before I took it to the shop, I replaced my rear brake shoes and drums, as well as the front brake pads. It passed inspection, but failed emissions. So, I replaced the oxygen sensor, cat, map sensor, and spark plugs. After that it passed emissions.

I just drove my car about 150 miles to relocate for a new job, and on the trip, my car shook. It started shaking at about 60mph, and continued to get worse as i topped it out at about 75mph. The best I can describe it is feeling like I am sitting on a washing machine at 60mph, and the washing machine being off-balance at 75mph. It not at the point where I feel unsafe driving it though. I took the rear wheels off and inspected the drum brakes and haven't noticed anything out of the ordinary.

Any ideas what could have went wrong? I was thinking maybe I lost a wheel weight. Or maybe a rear drum is not weighted properly. Any help would be great as i don't have too many resources where I am right now.

Thanks,
Ryan

 

Sounds like a tire out of balance, if you feel it in the steering wheel, its the front. If its in the seat, its the rears. whole car means all four. Also check for out of round on the tires. If its only at freeway speed, its probably just balance.