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Unidentified High Speed Vibration?

General Tech Talk

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Unidentified High Speed Vibration?

Post by dklyne454 »

Just fitted a set of new muddies, and now have terrible vibration.

They are the 33x12.5 BIGHORN. they have been balanced.

I realise that muddies will vibrate, as i had a set of 33 claws on my NJ Pajero, but it wasn't this bad.

The wierd thing is that it only happens at between 90kmph and 110kmph

Have checked uni's, bearings, engine mounts, gearbox mounts, and all seem fine.

Are these tyres just a particularly lumpy tyre, or are my body mounts maybee not absorbing enough?

Will be fitting a Body Lift this week, should i just put some absorbing rubber in aswell to reduce it and forget about it?
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Post by ROAD_KILL »

are these tyres radial or a bias/nylon side wall ?

if they are bias/nylon side wall thats proberly your problem .
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Post by dklyne454 »

It's a radial.
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Post by hudson44 »

If it didn't do it before and now it does with the new tyres, then i would say they haven't been balanced properly. Also chack for any play in the steering.
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Post by alien »

check wheel alignment too... perhaps take it to a shop you've never been to before and ask for balance and alignment, then its not assumed everything is all ok...
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Post by ... rick »

Try swapping fronts to back and see if there is any noticable difference. If there is at least you know its a tyre issue, and you wont be wasting time and $$ looking at other things.
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Post by bazzle »

BBM Rick wrote:Try swapping fronts to back and see if there is any noticable difference. If there is at least you know its a tyre issue, and you wont be wasting time and $$ looking at other things.
I would do the same 1st. Also the dynamics of some wheel and tyre assemblies show up any play in front end component causing "shimmy"
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Post by dklyne454 »

All fixed. :armsup:

As i said earlier, it was coming up through the body, so i didn't think it was the front tyres, as they would come through the steering shaft.

Turned out to be that 3 weeks ago off road, i took a good hit to the exhaust and bent it. it was subsequently rubbing on the shock absorber at a certain rpm. :bad-words:

Bent muffler back to where it should be and all good. :lol:

Thanks for the help though guys.
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