Zipper369
Full Access Member
So I've had this ongoing problem in my '99 Tahoe. Whenever I get close to 60 MPH I start to feel an intermittent shake. It comes and goes about every 30 or 40 feet (35 ft. of shake, 35 ft. of smooth, repeat). It feels like it's coming from the front somewhere. It's far more noticeable in the seats then it is in the steering wheel. The shake is on the slow side (about 10 or 20 Hz) because I can watch the passenger headrest move about an inch in either direction. The further past 60 I go, the worse it gets. At around 70-75 it feels like the front end is gonna start jumping off the ground, so I haven't pushed it past that. About 4 months ago I replaced the tie-rods, balljoints, and pitman arm. This made the shake less violent, but it's still there.
My first though was the wheels, but I had this problem before and after I got all 4 balanced and rotated. Also, if it were the wheels, wouldn't the shake be constant and not go away every other 30 ft.? I also thought about a warped brake rotor, but wouldn't that also be a constant shake?
I can't think of anything else that may be causing an intermittent shake like this. Any help is greatly appreciated!
P.S. I've also noticed that when coasting downhill, if it starts to shake, I can give it just a tiny bit of gas and the shake diminishes somewhat. This leads me to believe that it may be something in the driveline, but I don't know what it could be.
My first though was the wheels, but I had this problem before and after I got all 4 balanced and rotated. Also, if it were the wheels, wouldn't the shake be constant and not go away every other 30 ft.? I also thought about a warped brake rotor, but wouldn't that also be a constant shake?
I can't think of anything else that may be causing an intermittent shake like this. Any help is greatly appreciated!
P.S. I've also noticed that when coasting downhill, if it starts to shake, I can give it just a tiny bit of gas and the shake diminishes somewhat. This leads me to believe that it may be something in the driveline, but I don't know what it could be.