Vibration at speed

JEEP CHEROKEE
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JLEMON228
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When i drive at speeds over 100kmh i get a vibration throught he whole vehicle. I've replaced the tyres with brand new ones, i've swapped over full wheels with a mate's Jeep. I've had the tail shafts balanced. I've had the rear diff reconditioned. The suspension has been checked by Pedders (bloke i know there). There is a CV or something in the front tailshaft that was replaced. I have replaced the gearbox mount. I have ordered new front rotors as mine are in need of replacement
I am lost for ideas. Can anyone help please ???
1996 XJ Cherokee Sport - 4L Auto.
[img:e8215ae4d3]http://www.2carpros.com/forum/automotive_pictures/117404_jeremys_car_003_1.jpg[/img:e8215ae4d3]
Nov 14, 2007 at 3:29 AM
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RASMATAZ
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100kmh/62 mph

New tires were they dynamically balanced/lug nuts tighten to specifications. Could be an engine/tranny mounts loose.

An out-of-balance tire and wheel will typically create a vibration or shake that becomes progressively worse as the vehicle speed increases. The speed at which the vibration first becomes apparent will vary depending on the size and weight of the tires and wheels, the size and weight of the vehicle, the sensitivity of the steering and suspension and the amount of imbalance, but usually starts at 40 to 50 mph and increases in intensity as the speed goes up.
Nov 14, 2007 at 4:14 AM
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JLEMON228
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When i get over 100kmh the vibration is constant no matter what speed i do. The engine/tranny mounts have been checked and they are fine.

I haven't had the tyres dynamically balanced (i'm guessing that means on-car balancing???). They have been off-car balanced using a machine at a tyre place three times. May have to try the on-car balance. Only problem is, they can't balance at greater speeds.

Thank you anyway, will try that.
Nov 15, 2007 at 12:30 AM
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