Question about 1994 Jeep Grand Cherokee

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Vibration/humming when car is in drive and moving. thinking it could be trans or rear end hoping its neither

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Check your u-joints. If, when you are driving on the highway, you let off the gas and it stops imediately, it's most likely u-joints. The whining part leads me to believe it could be the differential. Be sure to check the oil levels on both diffs. And when you have the driveshaft off, see if you can wiggle the rear yoke on the diff. It could be the pinion bearings. You may have 2 problems. The vibration from u-joints, and the whining from the rear end.

Posted on Jun 15, 2009

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I sound more like there is something wrong in the wheels.I would check your bearings...

Posted on Jun 15, 2009

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My chevy truck is making a clonking noise in the rear end either wheel or im thinking drive shaft when i hit the gas on take off and while im doing like 50 mph what is it


drive shaft u-joints will make clanking sound putting in gear or have bad vibration to it . it can be pion bearing in rear-end it will do what you are saying . but check driveshaft , sometimes you can see if drive shaft has play in it move side to side .

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It could be as simple as a bad transmission mount. The bearings in an automatic transmission are not a roller bearing, they're all bushing type bearings without any rollers. The fluid in the transmission keeps them lubricated so they don't need moving parts. I would doubt that it's in the transmission if all the gears work smoothly. The only bearings like what you're asking for are the needle bearings in the planetary gears. If one of them were going I'm not sure you'd feel it while driving, especially at slow speeds like leaving the driveway.

I can point you to a website that has a part by part breakdown of your transmission if you like, but the pdf can take a while to download on a slow connection.

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Have you checked that the noise is not tyre noise?
Interchange the wheels front to rear (or left to right) to see if it has any effect on the noise.

Only do the test below if the car is securely chocked so as not to move, take great care not to contact moving parts!
Securely jack both the car drivewheels off the ground, then 'drive' the vehicle through through the problem drive speed/gears while listening for the noise. If the noise occurs under these circumstances you may be able to further localise the source by listening (very carefully!)with a short hose pipe held to the ear.

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