Question about 2004 Chevrolet Venture Passanger

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Vibration at 45 mph.

On smooth road, the van will sometimes vibrate at around 40 to 45mph. I have recently replaced the tires with no effect on the vibration. I returned to the tire shop, they rechecked the tire balance (was good) and checked the alignment (was found to be in spec). I suspect that Torque Converter Clutch engagement is contributing to the problem, but the vibration will not disappear completely when going down a slight grade with foot off the gas pedal (which should release the Torque Converter Clutch) and trans shifted to Neutral. Any ideas would be appreciated.

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  • liketoknow Sep 26, 2008

    Flathead40,

    I didn't go back to the tire shop, just raised it in the driveway with a couple of floor jacks. I could feel the vibration clearly sitting in the driver's seat. When I examined the rotating wheels and and driveshafts, I could clearly see the inner CV on the driver's side was vibrating a lot more than anywhere else. I am relatively confident that this is the source of my problem.



    How hard would it be to replace the axle shaft in my driveway?



    thanks,

    liketoknow

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First, if the milage is high it could be a cv halfshaft even if the boots are not split. if the tires are new and no rims are bent, make sure there is no fix -a- flat in the tires, (liquid will not balance) and cause a severe vibration. i would suggest you take it back to your shop and have them put it on a lift, raise up the front wheels under the outer part of the lower control arm where the front is not hanging down too far and start the vehicle. run it up to 45mph to 60mph and have them feel in the drivetrain for vibrations and shakes.if it is felt with the car this way the vibration is in the drivtrain. inner cv's or in the transmission. thanks and let me know what you find out.

Posted on Sep 20, 2008

  • paul haggard Sep 20, 2008

    wanted to add, inner cv joints can cause a vibration or a bent cv halfshaft. thanks

  • paul haggard Sep 29, 2008

    not too difficult if you have air tools. if you don't have air tools, remember to break the cv halfshaft nut loose before you raise the car off the ground, this will keep the wheel from turning. you can also have someone applie the brake and this will hold the wheel in place. the new halfshaft should have the torque specs or ask the person at the counter, it should also come with a new nut (30 to 36mm). you will need to raise and support the car by two jackstands under the frame, remove tire , remove the two nuts and bolts holding the steering knuckle to the bottom of the strut, be careful if there is a abs wire, THEY WILL NOT STRETCH and can break very easily. remove the outer tie rod, this will allow for more flexability of the steering knuckle assembly. remove the nut on the end of the cv halfshaft. sometimes these are rusty and will need a little help pushing it through the knuckle, ( hammer, air chisel, penetrating oil). when all of this is loose and out of the steering knuckle, pry the halfshaft out of the transmission. use a big screw driver or small pry bar, be careful though not to damage your transmission. you can also tap on it lightly with a hammer and pry bar. be careful not to damage the new halfshaft or transmission during installation. good luck and thanks for the revue.

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Sound like out of balance tire or a separated tire or bearing but, the two most common causes are the ones. I suggest visit some tire shop and would like to have the tires inspected and balanced.

Some customers may comment on shaking/vibration in the steering wheel, floor or seat while driving at highway speeds (typically between 60-72 mph (96-115 km/h)) on smooth roads.

These specific vehicles may be sensitive to various rotating mass assemblies, especially if they are considered to be out-of-balance.

In order to correct this:
1. Visually inspect the tires and the wheels. Inspect for evidence of the following conditions and correct as necessary.
- Missing balance weights
- Bent rim flange
- Irregular tire wear
- Incomplete bead seating
- Tire irregularities
- Mud/ice build-up in wheel
- Stones in the tire tread

2. Set the tire pressure to 30 psi (205 kpa) COLD.

3. If the road test indicates a shake/vibration still exists, check the imbalance of each tire/wheel assembly on a known, calibrated, off-car dynamic balancer. If any assembly calls for more than 1/4 ounce on either rim flange, remove all balance weights and rebalance to as close to zero as possible.

Important: Some GM dealers may have a Hunter GSP9700 Road Force Balancer. This will simplify Step 5 by not requiring dial indicators. If a Hunter GSP9700 machine is available, it may also be used to measure the radial force of the tire/wheel assembly. A guideline here is 18 lbs or less.

4. While on the balancer, measure wheel runout. If radial or lateral runout exceeds .020 in (0.50 mm) for aluminum wheels (.030 in (0.76 mm) for steel wheels), replace the wheel.

5. After confirming wheel balance and wheel runout, if any changes were made, road test the vehicle again.

6. If the smooth road shake/vibration still exists:
Important: The completed worksheet must be attached to the hard copy of the repair order.

Record Radial Force Variation readings if you have access to Hunter GSP9700 Wheel Balance equipment. Use the worksheet shown in this bulletin to record the readings.

If one or more of the tires have RFV readings in excess of 18 lbs, match mount the tires to get below 18 lbs. Readings of 12 lbs. or less are preferable for critical customer concerns.

If the RFV can not be reduced to an acceptable level, replace the affected tire with one obtained locally.

The screened tire program is no longer in effect for Bridgestone/Firestone, Goodyear and Michelin. Low speed screened tires are available from Continental General only, and only for the Buick LeSabre.

Road test the vehicle to ensure the shake/vibration has been resolved.

7. Replace both lower control arms on vehicles built prior to the VIN breakpoints shown. The new lower control arms may provide an incremental improvement to the vehicle ride. Customers who have become "tuned in" to the shake condition may still feel some shake in the vehicle after the new lower control arms are installed.
Refer to Lower Control Arm Replacement, (refer to the Parts Information table below for SI document ID numbers).

Important: THE CONTROL ARMS SHOULD ONLY BE INSTALLED ON VEHICLES IF, AFTER THE TIRE AND WHEEL DIAGNOSIS AND REPAIRS HAVE BEEN PERFORMED, THE VIBRATION CONDITION STILL EXISTS.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice weekend.

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A vibration such as you are talking about could be caused by more then one thing. First it could be caused by a broken belt in one of your tires. I could also be caused by a bent rim, a warped rotter, or a bad cv joint. I hope this helps you solve your problem.

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