drive train vibration

[ghuds]

We recently installed a rough Country 2 1/2" lift and 33" tires on my son's 92 Bronco. Since then it has developed a nasty vibration from start to about 40 mph. - above 40 it goes away. The vibration dosen't change weather in 4x4 or 2x4. It is really evident when letting off or slowly applying the throttle. The U joints seem ok - could it be something in the transfer case? It sounds like it is coming from under the rear of the drivers seat. Help - he is out of money and really frustrated!! (

 

[89Bronco58]

hmm well, id start by making sure everything is tight and the u joints are ok, replace them anyway, they arent much, make sure the shafts are all ok and ive heard that when after installing a lift the front end may need to be aligned, try that, i doubt thats it but you never kno, sounds liek a balance or looseness problem to me

 

[RodLee]

Have you had the tires ballanced? When I rotated my 33's I got a lot of vibration in the steering wheel around 50 mph. Then had them ballanced. problem solved.

 

[ghuds]

hmm well, id start by making sure everything is tight and the u joints are ok, replace them anyway, they arent much, make sure the shafts are all ok and ive heard that when after installing a lift the front end may need to be aligned, try that, i doubt thats it but you never kno, sounds liek a balance or looseness problem to me

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The tires were balanced and the front end aligned after the lift was installed. The vibration is definitely coming from somewhere in the drivetrain.

 

[bidibronco]

I've heard of people putting a lift on there trucks and the driveshaft angle be off a little. I'm not sure if that's it but maybe something to look into.

 

[ghuds]

I've heard of people putting a lift on there trucks and the driveshaft angle be off a little. I'm not sure if that's it but maybe something to look into.

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Thanks for the info! I was thinking that was a good place to start. The rear driveshaft is really angled now - i'm going to disconnect it and just run the front axle to see if it goes away. Thanks again!

 

[cw95bronc]

I have a 95 bronc that is not lifted, good balanced tires new hubs and bearing on front. I have the same problem at 35 to 40 mph regardless of which gear or drive its in accelerating or braking. I am corius to find out your results. Any help would be greatful

 

[cw95bronc]

ooops! Sorry made a mistake