I have a 2000 GMC sierra regular cab long box and it shakes and shimmies quite noticibly. The "service 4WD" message started coming in recently but is not in all the time. I don't think the shaking has to do with the tires or wheel alignment but am not 100% sure. Any help would be great before I have to take it in and spend a bunch of money. I never abuse it and hardly used the 4WD, it only has 60,000 kM on it.
Anybody help??
