Could be maybe so??

Denisefwd93 · Jan 15, 2018

My truck has had this all the time 35 to 55 mph back/rear end shudder / vibration. Last night on the way home after driving about an hour, coming down a right curve ramp I noticed it quite pronounced while making the turn so now I'm thinking it is the driver side rear axle bearing? And not the driveshaft (93, 4wd 4.0)

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Denisefwd93 · Jan 17, 2018

OK guess I shoulda put "rear axle bearing" in the heading LOL

cp2295 · Feb 10, 2018

Inspect u joints, driveshaft carrier bearing first. If the vibration is load and speed dependent it is going to be something in the driveshaft. If it is speed dependent it will be the wheels/tires/balance.

A bad bearing won’t cause a vibration, it’ll make a growling/humming noise.

If the driveline has no noticeable damage I would not suspect it being out of balance.

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Denisefwd93 · Feb 16, 2018

cp2295 said:
Inspect u joints, driveshaft carrier bearing first. If the vibration is load and speed dependent it is going to be something in the driveshaft. If it is speed dependent it will be the wheels/tires/balance.

A bad bearing won’t cause a vibration, it’ll make a growling/humming noise.

If the driveline has no noticeable damage I would not suspect it being out of balance.

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I didn't realize I had a reply! I haven't done anything with it. it's been too cold and raining . Oh it's a one piece driveshaft long bed

some days the shakes more than others I'm not quite sure it's temperature related

I was " told" the U joints and slip yoke where okay when they dropped it and greased the slip yoke spline thing. But this is the same trusted garage I used for many many years that I told me my ball joints were okay and they were completely shot.

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Doofy · Feb 16, 2018

Perhaps they installed the driveshaft "out of phase" when they reinstalled it. Not sure how you could tell. Everything I read says "matchmark" before removal so as to reinstall in exact same position. This would lead me to believe that if out of phase...could possibly cause a vibration.

scotts90ranger · Feb 17, 2018

out of phase is easy to tell, the U joint yokes on the center part of the shaft should line up, U joint caps in line in other words...

That speed range is saying blown cord in a tire to me, or badly out of balance, had it happen several times in my short driving career

Denisefwd93 · Feb 17, 2018

scotts90ranger said:
out of phase is easy to tell, the U joint yokes on the center part of the shaft should line up, U joint caps in line in other words...

That speed range is saying blown cord in a tire to me, or badly out of balance, had it happen several times in my short driving career

Did it with the old tires, new tires have been well balanced and rotated twice now but it's always had a little Shake between 35 and 55 mile an hour. I hope it's drive shaft but I know the bearings go bad on these rear ends prematurely unless people just change them just for fun. But making shake on long ramp turns kind of makes me think think axle bearing instead of drive shaft. Thanks all!

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Could be maybe so??

Denisefwd93

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Denisefwd93

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cp2295

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