- #14 of 22
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Bad Shake/Vibration 250,000 miles 93 Jimmy
by wings_2007
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Jun 30, 2006 (8:57 pm)
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I have a 93 GMC Jimmy SLE 4x4. Bought it in 96 when it had 33,000 miles. I just hit 250,000 miles yesterday. It's the original motor and transmission. Obviously it's been a great vehicle. But it has developed a horrific vibration that no one seems to be able to figure out.
It's good on extremely bumpy dirt roads at any speed, and good at highway speeds. But when I hit small bumps at 5-55 mph on paved "rural" roads (such as a little mound of ashphalt left over from a road repair) I get a horrific vibration throught the vehicle. (It seems less horrific if I am going 60 mph or faster) The vibration isn't really in the steering wheel so I don't think it's the idler arm or pitman arm or anything like that. Plus those things check out ok and have been recently replaced.
I also know for sure it's not the shocks as they have been replaced twice. The ball joints have also been replaced. The drive shaft is fine and the u-joints have been changed. I have even checked the body mounts, motor mounts, and transmission mounts and they are fine. I have also checked the rear axle bearings. All of those things check out ok...but the vibration/shake is still there.
Anyone have any suggestions?? The vehicle runs great and I would love to get another 250,000 miles out of it. But this vibration is conerning me. I hate driving a vehicle when there is an unknown problem.
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- #15 of 22
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Re: Bad Shake/Vibration 250,000 miles 93 Jimmy [wings_2007]
by tidester HOST
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Jun 30, 2006 (10:50 pm)
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Replying to: wings_2007 (Jun 30, 2006 8:57 pm)
You may want to try the Chevy Blazer/GMC Jimmy: Problems & Solutions discussion.
tidester, host
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- #16 of 22
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Re: Bad Shake/Vibration 250,000 miles 93 Jimmy [wings_2007]
by repairdog
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Jul 01, 2006 (2:32 am)
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Replying to: wings_2007 (Jun 30, 2006 8:57 pm)
Rear mounts for the torsion bars are rubber and separate - look back there. Other area that could be a problem is the front sway bar rubber mounts so look at those too - bolts to the frame and to the front steering knuckle. Are the tires good and when they balance watch and make sure the rubber does not wander due to an internal broken cord and then see if a rim is not bent by watching it rotate.
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- #17 of 22
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Did you find the problem- i have same problem!!
by chispied
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Jul 27, 2006 (2:08 pm)
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Hi
I have same problem, my is at 220,000, shakes really bad...esp around 90-100k..mine increases the shaking with speed.
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- #18 of 22
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Re: Bad Shake/Vibration 250,000 miles 93 Jimmy [repairdog]
by wings_2007
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Jul 27, 2006 (4:12 pm)
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Replying to: repairdog (Jul 01, 2006 2:32 am)
Thanks for the info. It's been a while since I first posted but I've still got the vibration. Haven't had much time to check the vehicle myself or to check with my mechanic. We have checked the torsion bar mounts and they seem ok. Although I did have to replce them about 150,000 miles ago. We checked the bolts to the frame and everything seems ok. I got some new tires last week (Good Year's) and hope to have them put on this Saturday.
I will post an update ASAP.
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- #19 of 22
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Re: Bad Shake/Vibration 250,000 miles 93 Jimmy [wings_2007]
by repairdog
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Jul 29, 2006 (3:30 am)
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Replying to: wings_2007 (Jul 27, 2006 4:12 pm)
Rear pinion bearing, U-joints, rear xfer case bearing. Get the tire/wheels force balanced (better machine) that makes sure both are good and heavy areas offset. At 250k its getting old and tired I guess. Finally check those rear drums for out of round - seen that and have to run it on a lift or jack stands to see the oval drum wobble - be careful.
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- #20 of 22
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Re: Bad Shake/Vibration 250,000 miles 93 Jimmy [repairdog]
by wings_2007
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Aug 20, 2006 (5:42 pm)
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Replying to: repairdog (Jul 29, 2006 3:30 am)
Thanks again for your suggestions. I think I finally found the main problem - a bad body mount. I guess my mechanics somehow overlooked it. I decided to crawl under there the other day with a crow bar to get a closer look at things. I noticed the mount near where the front door and fender meet on the passengers side was rusted. (Actually I guess it's the plate that the mount attaches to that's rusted.) So I took the crow bar and discovered I could move the body away from the frame/mount at that spot rather easily. I'm guessing that would give me the horrific vibrations. It should be fixed this week. I will post an update.
Hopefully to say the vibratrion is gone! 
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- #21 of 22
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Re: Bad Shake/Vibration 250,000 miles 93 Jimmy [wings_2007]
by wings_2007
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Aug 23, 2006 (3:11 pm)
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Replying to: wings_2007 (Aug 20, 2006 5:42 pm)
Finally after all this time the problem seems to be fixed. The mount was bad, the plate it attaches to was terribly rusted, and the floor board under that was all rusted away (13 years of Michigan winters and road salt will do that). Although you couldn't tell the floor was rusted just by looking. GM puts a rubber mat type thing in that spot of the floor board which holds it together even when rusted. It's defintely not an easy job having to replace the mounting plate and part of the floor but it was well worth it! Now when I hit bumps it's nice and smooth - Or as smooth as can be expected for an SUV with over 250,000 miles on it. I hope top get at least another 100,000 more miles now. GMC rules!! 
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- #22 of 22
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michael 79 possible rear bearing noise
by michael79
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Jul 01, 2009 (4:28 pm)
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the noise started a few days ago, sounds like metal was caught on the rotor, but now after really listening to it, it is on the right rear side when i turn to the left and nothing when i turn to the right, it is getting worst, last longer, grinding sound now.
thanks for the help
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