Shop Buick Control Arms

I have a 2001 Buick LeSabre Custom 3800 Series II and while driving above 40+mph, Im getting a "humming" noise. When it's just me in the car, I hear it out of my right ear and if there is a passenger, they hear it out of their left ear. When I hear the "humming" noise, I'll goose the gas pedal a few times and the pitch of the humming will variate... I have rebuilt the entire front end it seems! LOL... complete rebuilt transmission, new GM transmission mount, replaced both sides axle shafts with GM OEM shafts, new lower right control arm. 4 new tires/brakes and rotors all around, new front wheel bearing hubs and a new alternator! The humming occurs in gear D4 but with the transmission fully rebuilt... To me personally, it sounds like the humming is somewhere in the throttle or acceleration since the pitch variates when you goose the pedal when you hear the noise! I'm not an expert on mechanics but has anyone had the same problem that could help me please??? Thank you very much!!!

Probably a bad hub bearing. Have it checked by a professional.

Hammer Time - I have new wheel bearing hubs on the front but that's not to say that 1 isn't bad... also it's a humming noise, not a growling noise. The sound pitch goes higher when you goose the gas and goes lower when you let off. I appreciate your help and will look into the hubs!

Like i said, have a professional listen to it. We can't diagnose a noise we can't hear.

2006 Chevy Uplander, 2.5l engine, 160k KMs

I have a heavy metal-on-metal clunk (sounds like a dead shock) in my rear of my 06 Chevy Uplander. Even the smallest of bumps cause the clunk. I put on new shocks and a new trackbar (both of which I was told was the problem). There are no struts on this model, just springs and shocks. There's nothing broken on the springs.

The only other thing I could think of are the control arm bushings but there's no play in them at all. I removed the spare tire and my storage area is empty. Also checked for play in the side and rear doors - all good. Any idea what is causing the sound, and more importantly, how to stop it?

Agreed,shouldn't be too hard to pinpoint, especially if you have Chassis Ears as HT mentioned.

Check into these TSB's, may apply to your concern

Subject: Noise Or Clunk In The Rear Suspension - keywords bushing clunk noise rattle rear suspension thump #PIT3323C - (01/23/2007)

Models: 2005-2007 Buick Terraza 2005-2007 Chevrolet Uplander 2005-2007 Pontiac SV6 2005-2007 Saturn Relay



This PI was superseded to update Model Years. Please discard PIT3323B.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern:
Customers may report loud clunk or noise while driving in the rear suspension of their crossover sport Van equipped with FE1, FE2 or FE3 rear suspension. The noise maybe described as the muffler hitting the floor pan or a loud slapping noise. Recommendation/Instructions:
Inspect and replace the rear trailing arm bushing P/N 10341351 as needed.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.




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Subject: Stiff Rear Upper Suspension Or Shocks Clunk Over Bumps - keywords bushing cargo GMT201 noise rear #PIT3861A - (08/04/2006)

Models: 2005-2007 Buick Terraza 2005-2007 Chevrolet Uplander 2005-2007 Pontiac SV6 2005-2007 Saturn Relay Cargo or Incomplete Mobility Vehicles Only



This PI was created to add 07 MY. Please discard PIT3861.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern:
If the customer/fleet operator finds the suspension too hard (shocks clunk because of full extension over bumps), ask how the van will be used. If it will be loaded with several hundred pounds, the suspension will be alright. If it will be used predominately with light loads and the customer is objecting to the ride characteristics see recommendations below. Recommendation/Instructions:
Replace the rear springs with 22132418 which will reduce the spring preload by 600 pounds

1. Make sure the customer is objecting to the ride characteristics, not the dealer sales department.
2. Record trim heights with the original and the replacement springs and forward the information to tom.geist@gm.com.