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Old 11-05-2013, 11:42 AM   #1
Join Date: Nov 2012
Location: Kansas
Posts: 27
SuzyF is on a distinguished road
hums, thunks, rattles and questions

couple things I need some clarification on.
My 2000 Wrangler is making thunk/rattle noises from the passenger rear suspension. Only over bumps and it does it when you rock the bumper up and down. My #1 thought is it is time for new shocks. When I looked under it to check the springs and control arms. I also checked the sway bar and sway arms. They looked ok. However:
1. Is it normal for the sway bar/arms to have about a 1/2-1" horizontal play in them?
2. If it is the shocks, which I'm pretty sure it is, is there something I need to know when ordering new ones since the Jeep has a dealer installed 3" lift on it?
3. I live on a really, rough gravel road with huge potholes. I don't want cheap-ass shocks, but I don't want expensive off-road ones either. Is there a good heavy duty shock available at a reasonable price from NAPA, O-Reilly etc?

Second issue and this is somewhat bizarre. I have noticed on speeds over 65mph on the highway, that I get a strange almost inaudible humming noise as well as a very, very small vibration in the steering wheel. Most people wouldn't even pick up on it, it is so minor. The weird thing is that it is cyclic. Meaning, it hums/vibrates for roughly 3 secs, stops for 1 sec, hums/vibrates for 3 secs, stops for 1 sec. Rotation of wheels, tires, driveshaft, u-joints etc go through tons of complete cycles at those speeds so it cannot be something that affects componets,to the best of my reasoning. I thought it might be the cruise cycling, but it does it whether cruise is on or off. Then I thought it might be the highway pavement, but it does it on different highway surfaces. No sign of it at lower speeds. Jeep drives smooth and straight. Any ideas?
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