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Drive line vibration
darryl2005
Member Posts: 3
My son noticed a vibration problem with our grand Cherokee 3.7 awd. And starts once the speed is 65 or more under acceleration. This only happens on the highway traveling 70-80mph. We have been advised that the transfer case needs to be replaced and the drive shaft balanced. From what I have heard the drive shaft for this car cant be balanced. Any feedback as to the actual cause is welcomed so I can avoid spending money needlessly replacing one part and finding the problem still exists.
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0patience
Member Posts: 1,712
Have you had the tires balanced first?
Driveshafts don't just come out of balance, unless you hit something, knocked a weight off or the u-joints are bad.
Before replacing the driveline or transfer case (have no idea where they came up with that), check the u-joints and see if they are tight and no play in them and see about having the tires balanced.
My bet is you have a tire balance problem or broken belt.
Question though, who advised you to balance the driveshaft and replace the transfer case?5
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You also added lack of power in your last post but not the first. Is that a definite symptom or something that you sort of feel/sense. You know how it is when noises or feelings in your vehicle get into your head
Just ideas...
Drivetrain vibrations, tend to be constant, growing in severity as the speed increases.
Tires tend to like to show up between 45-70 mph as a problem.
So, if a visual inspection of the driveline doesn't show anything obvious and the u-joints have no play in them, then start with the likely suspect and work from there.
And since you discussed the power loss, there is a possibility that a misfire is the cause of the vibration and power loss. This would cause a high rpm vibration and a power loss.
When was the last time it had the spark plugs changed?
When was the fuel filter last changed?
If it has one, not sure if that has the screen or actual filter.
Remember, we are working with the info you provide, so if the answers seem incomplete, it is often hard to see the whole picture from words.
Normally, I don't see tire,balance problems show up until at least 45 mph, with 60 mph being the most common point. I have one truck right now that one tire was way out of balance, it started shaking at 61 mph.
I've never seen tires show problems on braking though, but anything is possible.
Try this. Go to Goggle play and search for a vibration frequency diagnostic app. Then post the speed you are traveling when you feel the vibration, the engine RPM and the frequency that the app reports. Try measuring the vibration with the phone in different locations and report where it senses it the strongest. Aka the top of the dash, the floor both the left and right side as well as the rear seat area, center console if equipped .....
Here is a sample app. There are many others. https://play.google.com/store/apps/details?id=pl.alitec.mvibe&hl=en_US