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72 is it!

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Old Nov 5, 2022 | 09:12 AM
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72 is it!

NO, not my age! At 72 mph and up I get vibration. New and balanced tires, front end alignment and new u joints. I'm thinking about taking the whole driveshaft to the machine shop for it to get balanced. What do you guys think?
 
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Old Nov 5, 2022 | 09:46 AM
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Doing it before new tires?
 
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Old Nov 5, 2022 | 03:53 PM
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My Rear Drive shaft needed spacers on the axle to keep it centered ( cheap or wrong U joint I suspect ) .
 
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Old Nov 5, 2022 | 10:34 PM
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Originally Posted by BuddyBarnes
Doing it before new tires?
Yes, the new tires didn't seem to make any difference.

Originally Posted by Action4478
My Rear Drive shaft needed spacers on the axle to keep it centered ( cheap or wrong U joint I suspect ) .
Thanks Rick, I don't know how to check on that?
 
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Old Nov 6, 2022 | 06:48 AM
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Chasing vibes isn't fun. I spent the summer chasing mine.

Shaft balance and check angles. Is rear axle ubolts tight and how are the bushings?

Good read I found on vibes
https://www.tirereview.com/driveshaf...n-frequencies/
 
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Old Nov 6, 2022 | 08:05 AM
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Originally Posted by knottyrope
Chasing vibes isn't fun. I spent the summer chasing mine.

Shaft balance and check angles. Is rear axle ubolts tight and how are the bushings?

Good read I found on vibes
https://www.tirereview.com/driveshaf...n-frequencies/
They got that down to a science. I might also mention that I get the vibration with and without the 5er attached.
 
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Old Nov 6, 2022 | 04:37 PM
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Originally Posted by oldbird1965
Yes, the new tires didn't seem to make any difference.



Thanks Rick, I don't know how to check on that?
On mine I loosened the rear straps & could move the joint where it bolted to the yolk side to side. I measured the distance ,& shimmed it on both sides
 
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Old Nov 6, 2022 | 05:42 PM
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Originally Posted by Action4478
On mine I loosened the rear straps & could move the joint where it bolted to the yolk side to side. I measured the distance ,& shimmed it on both sides
Interesting, I'll have to check that out!
 
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Old Nov 7, 2022 | 12:25 PM
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i had a yoke cap that wore out from ujoint fail, i had a donor axle with good parts

can drill out yoke and use straps instead which are so much easier to replace and acquire.
 
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Old Nov 10, 2022 | 04:09 PM
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Glenn I just saw this one.

Is it a constant vibration?

 
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Old Nov 11, 2022 | 08:01 AM
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Yes, above 72 it will shake the truck pretty good.
 
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Old Nov 24, 2022 | 08:01 AM
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Just an update, it was the rear universal joint. It didn't have any slack in it but was stiff to move around. At first I didn't think there was a problem with it because it wasn't loose with lot of movement in it. Went for a ride its a lot better but not perfect vibration wise. I also wanted to change out the carrier bearing but for some reason couldn't get the slip yoke apart. I was afraid of forcing it apart and then couldn't get it back together again. Any thoughts on why it won't come apart?
 
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Old Nov 24, 2022 | 11:43 AM
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Originally Posted by oldbird1965
Just an update, it was the rear universal joint. It didn't have any slack in it but was stiff to move around. At first I didn't think there was a problem with it because it wasn't loose with lot of movement in it. Went for a ride its a lot better but not perfect vibration wise. I also wanted to change out the carrier bearing but for some reason couldn't get the slip yoke apart. I was afraid of forcing it apart and then couldn't get it back together again. Any thoughts on why it won't come apart?
Grease drys and clumps, a few whacks should do the trick. I would suggest you mark it before taking it apart, and also add a zerk fitting on the slip yolk (female side) this will require drilling a hole and tap for a zerk fitting, then you will have a serviceable part that will prevent wear and clumping of grease on the slip yolk
 
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Old Nov 25, 2022 | 07:56 AM
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Thanks Adam, I was wondering why it didn't have a zerk fitting.
 
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Old Apr 29, 2023 | 08:49 AM
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Finally found a place that balanced my driveshaft. This makes a big difference for me! I'm over 500 miles into my annual trip and now I can 'let it roll' at the bottom of a hill instead of burning up my brakes. Before it would shake the crap out of the rig, now its smooth over 70mph. Not that I like going that fast pulling 18K but its nice to let it roll at times. The machine shop added two weights on each side of the carrier bearing and that did the trick.
 
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