Question about 1999 GMC Denali

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Towing 5500 lbs the front end of my 1999 Yukon Denali shakes the stering wheel aggresively around 62 mph. This does not happen when the truck is unloaded and is very smooth at 75 pmh. News tires, new shocks, ball joints are tight and this happens with or without a load distribution setup.

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  • kevin_kelley Aug 03, 2010

    Towing 5500 lbs the front end of my 1999 Yukon Denali shakes the stering wheel aggresively around 62 mph. This does not happen when the truck is unloaded and is very smooth at 75 pmh. News tires, new shocks, ball joints are tight and this happens with or without a load distribution setup.

  • kevin_kelley Aug 03, 2010

    Towing 5500 lbs the front end of my 1999 Yukon Denali shakes the stering wheel aggresively around 62 mph. This does not happen when the truck is unloaded and is very smooth at 75 pmh. News tires, new shocks, ball joints are tight and this happens with or without a load distribution setup.

  • kevin_kelley Aug 03, 2010

    Towing 5500 lbs the front end of my 1999 Yukon Denali shakes the stering wheel aggresively around 62 mph. This does not happen when the truck is unloaded and is very smooth at 75 pmh. News tires, new shocks, ball joints are tight and this happens with or without a load distribution setup. Front end was aligned w new tires. Tounge wieght is only 600 lbs.

  • kevin_kelley Aug 03, 2010

    alignment has been done

  • kevin_kelley Aug 03, 2010

    Towing 5500 lbs the front end of my 1999 Yukon Denali shakes the stering wheel aggresively around 62 mph. This does not happen when the truck is unloaded and is very smooth at 75 pmh. News tires, new shocks, ball joints are tight and this happens with or without a load distribution setup. and alignment has been done.

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5 Answers

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  • GMC Master
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Some times bad wheel bearing can be one of the cause to wheel vibration; but, in this case have you checked the steering/ball joints first to see if any is worn (have the joints been regularly lubricated)? One other possibility is the wheel alignment, assuming your wheels are balanced, and all joints are solid or its the steering shaft, its needs to be adjusted.

Try it and tell us news.

Posted on Aug 03, 2010

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What about the control arm bushings? Did you have an alignment done? Did you have the problem before you had all those parts replaced? Also could be worn hub bearing. even drive axle/cv issue. Have you had it inspected by a decent mechanic? I would check those things out first? How many miles are on the vehicle? I can assist you further if need be.
Thank you,
Lee

Posted on Aug 03, 2010

  • Lee A.
    Lee A. Aug 03, 2010

    It seems you requested further assistance. You didn't even answer all my questions or give me proper feedback based off my first solution. It definitely sounds like one of the things I have already mentioned. I hope you will reconsider and accept/rate my solution accordingly.
    Thank you,
    Lee


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  • Master
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The problem is your springs are sagging or you have too much tounge weight on the trailer which allows the front end to point too far up. Try moving some of the weight back some to see if it helps. Also you should have the alignment checked. Shocks do not change the angle of the ride.

Posted on Aug 03, 2010

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  • Expert
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Hi! As a first course of action, have your tires balanced. Since you got new tires they need to be balanced for better ride and handling stability. Hope this helps and have a good one!

Posted on Aug 03, 2010

  • dj_relly999
    dj_relly999 Aug 03, 2010

    Well you can try checking the lug nuts too if they are evenly tight. If the lug nuts are little loose it wiggles/vibrates.

  • dj_relly999
    dj_relly999 Aug 04, 2010

    Stabilizer bushings may be worn which can cause instability too. You may want to check on that.

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  • GMC Master
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Be Safe and slow down!
Read up on the fine prints on you trailer hitch.
=== Class 4 or Class 5? Class IV hitches are rated for up to 10,000 pounds and up to 1,200 pounds of tongue weight. This style of hitch can be found on some full-size ½-ton trucks, but are more common on ¾-ton and 1-ton light-duty trucks. The Class IV hitch is used for larger boats, car trailers, large campers, and medium-duty cargo trailers. Class IV hitches usually feature weight distribution setups.
Class V hitches are for loads up to 15,000 pounds and up to 1,700 pounds of tongue weight. These hitches are for heavy-duty loads such as large campers, large boats, horse trailers, multi-car trailers, and other heavier towing loads. These hitches are usually of a weight distribution type.
===
The vibration is cause be harmonic and weigh distribution (within the cabinet).
Next time you bring out the trailer try the following
1)add 1-2 psi more on each wheels (please refer to owner's manual)
2)keep the tow weigh down. Move all cargo into the Denali.
3)shift the weigh of the cargo inside the Yukon Denali into the center or before the rear axle to improve central of gravity CG)
With the proper loading distribution the harmonic will balance out.




Posted on Aug 03, 2010

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