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Old 04-07-2007, 07:36 PM
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My truck has a vibration...

When accelerating/decelerating through about 40 mph I can feel a vibration coming from the back of my truck. The vibration seems to be magnified if I'm applying the brakes and decelerating through 40 mph but it's still noticeable if I'm just coasting or cruising at that speed. I balanced and rotated the tires and the the vibration is still there.

I'm thinking maybe my driveshaft is out of balance?

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Old 04-07-2007, 07:44 PM
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sounds like a u-joint has gone bad.
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Old 08-04-2007, 06:27 PM
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I have to bring this back up because I am still having this problem and it's really starting to annoy me. The u-joints were in good shape but I replaced them anyway. The carrier bearing also needed to be replaced but it did not help the vibration. The two piece driveshaft only goes together one way (there's a master spline) and it's assembled correctly with the u-joints all in the same plane. The wheels and tires have been balanced and rotated twice now in the last year with no change.
I have two new ideas:
Could the driveshaft be out of balance?
My dad suggested that maybe a tire has a broken belt?
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Old 08-04-2007, 06:37 PM
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It could be a broken or slipped belt on one of the rear tires.....rotate the tires around and see if it changes anything. It could also be a warped wheel..have you checked that? It could also possibly be a rear axle bearing.
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Old 08-04-2007, 06:46 PM
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You got a leaky spark tube...
 
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The tires were rotated when they were rebalanced two weeks ago. The vibration didn't change. It also doesn't appear that there is an excessive amount of weights on any of the wheels. Without pulling the tire off the rim, how could I tell if a wheel is warped?
I haven't checked axle bearings. The truck has floating axles so I could pull the axle and should be able to shake the hub around to see if I have any movement, right?
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Old 08-05-2007, 07:01 AM
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my truck has a vib

Check the hanger where the two halves of the driveshaft connect. I've seen weak ones cause vibrations. I've also seen guys replace complete differential assemblies only to find out later it was just a worn out, sloppy hanger.
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Old 08-05-2007, 10:56 AM
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Vibration

Had the same thing as you ,found out it was a cracked flex plate . Are you running an automatic or a stick?
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Old 08-05-2007, 01:35 PM
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ernkazern, I think you're referring to the carrier bearing (driveshaft support bearing)? The rubber on it was bad and I replaced it but it didn't solve my problem.

Chevmal, the truck is a stick and had a clutch put in last fall. I had the flywheel resurfaced at that time and there were no obvious cracks or other damages. The vibration was the same even before that.

I am not at home and have not yet checked out the spindle bearings as Henry Highrise has suggested. I'm still trying to figure out how to check a wheel for warpage if it's still mounted on the tire.
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Old 08-07-2007, 11:18 AM
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Jack it up and remove the rear wheels and tires, then get in and run through the gears like you would if driving. If the vibration is there, it's not the wheels or tires.
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Old 08-07-2007, 12:15 PM
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Quote:
Originally Posted by techinspector1
Jack it up and remove the rear wheels and tires, then get in and run through the gears like you would if driving. If the vibration is there, it's not the wheels or tires.
Great idea, I'll give it a try when I return home next week.
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Old 08-07-2007, 10:02 PM
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What about your brakes? Any chance the vibration is from a warped drum? (or disc) You could check and see if one side is running hotter than the other indicating that one side is hanging up slightly. You could also check the diameter of the drums or check the condition of the shoes. Unlikely, given what you described, but worth a check if you have the wheels off anyway.
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Old 08-08-2007, 02:29 AM
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It has 4 wheel discs. It is getting due for new brakes in the very near future but I don't think they're the issue. Even stepping on the brakes the only time I get the vibration is in the 35-40 mph range. Even very hard pressure on the brakes above and below that speed will not cause the vibration. I will check it though when I get home. Thanks.
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Old 08-08-2007, 02:25 PM
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I had the very same trouble after installing new rear drums, the drums needed cut. I'll bet your rotors need replaced. Might want to cut the new one's before the install.
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Old 08-10-2007, 07:54 PM
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This vibration isn't just while using the brakes. Any time at 35-40 mph brakes or no brakes. I'm going to try a couple of the suggestions from the other posters sometime next week after I get home.
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Old 08-10-2007, 09:12 PM
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out of balance drive shaft possibly? try while its up on jackstands taking the drive shaft out and puttiting it in gear and accelerating to that speed if it stops its either something in the rear end or drive shaft or (something up front) and if it still does it its something in the engine or trans....or possably a bad mount.
just my $.02
Shane
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