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Country Discussion Topics
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Vibration in GMC Suburban???????????
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Mark    Posted 09-25-2001 at 18:06:40       [Reply]  [Send Email]
I own a 1985 GMC Suburban 3/4 ton two wheel drive 454 ci auto. I am getting a pulsating vibration somewhere in the driveline. It starts at 65 mph. I can shift it into neutral and the vibration disappears. I have changed the U joints and the carrier bearing and it still does it. The drive shaft does not have any visible damage or lost a weight. Any help would be greatly appreciated!
Thanks Mark


Chris    Posted 05-30-2002 at 12:34:22       [Reply]  [Send Email]
A little late here, but... Our 1998 GMC Suburban has the same annoying problem of vibration. We replaced some U joints, front brake rotors and pads, and rebalanced the tires. We just got the car back today and it seems okay but I'm skeptical. Did you eventually fix your problem and have you had similar problems since?


remington    Posted 11-09-2002 at 20:12:42       [Reply]  [Send Email]
i have a 86 burban...3/4 ton 4wd...a horrible shimmy and shake, vibration...lessens as you get going buy is still there...has been lifted 4"...truck was 2wd...so that is where carrier bearing is...does the 4wd have a carrier bearing/2 piece driveshaft stock? any help?


remington    Posted 11-09-2002 at 20:12:16       [Reply]  [Send Email]
i have a 86 burban...3/4 ton 4wd...a horrible shimmy and shake, vibration...lessens as you get going buy is still there...has been lifted 4"...truck was 2wd...so that is where carrier bearing is...does the 4wd have a carrier bearing/2 piece driveshaft stock? any help?


LazyHorse    Posted 09-26-2001 at 06:35:08       [Reply]  [No Email]
Have you had your tires balanced? Once you shift to neutral and let off the gas, the slowing vehicle may make the vibration go away. I've seen lots of vibration caused by tires out of balance, belts starting to seperate, or slightly bent rims. Another possibility is a rear axle bearing. My father in law had a 77 3/4 ton suburban 454, and it continually wore the bearing on the right drive axle. It also had limited slip rearend, which could have been a limited slip differential problem.


Burrhead    Posted 09-25-2001 at 18:44:04       [Reply]  [No Email]
My son had the same prob. With the same symptoms We changed switched and rebuilt everything we could think of and even carried the driveshaft and had it balanced.

The prob turned out to be the pinion bearing in the rearend. It would check tight enough by hand shaking it but it was letting the pinion run in and out on the road.


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