Question about 1990 GMC Suburban

2 Answers

93 gmc suburban - ujoints?

Vibration while accelerating - especially if towing. U-joints appear good-no play, nice and tight. However, there is a lot of play where the yoke comes out the tailshaft (the "cone" with the 4 bolts at the back of the tranny). There's also a leak on the front side of the tailshaft. Is the "tailshaft" rebuildable? Are there bearings inside as well? It has been over 15 years since I've messed with a trans. Could definitely use some advice. Thanks, Earl.

Posted by on

  • 1 more comment 
  • earlybird708 Feb 28, 2009

    update: I changed both ujoints and rear trans mount along with filter and fluid. THAT vibration went away. I can't seem to get the counter sales people to understand what I'm looking far as far as the seal and bearing for the tailshaft. Also, after doing this work, its VERY sluggish at start up to approx 30mph. If I floor it, overdrive doesn't kick in. What did I screw up?

  • earlybird708 Feb 28, 2009

    the yoke is SMOOTH. Surprisingly looks brand new.

  • chopperdoc Mar 19, 2009

    I just bought a 1990 gmc suburban sle , 5.7 4wd, It has a serious vibration from take off until 35 mph, it seems the vibration is in the rear, I also notice the smell of gear oil, but do not see any leaking, it seems to fade out at 35 up to 45 then pick up again at 55 , I noticed a few spots in the tire, not flat spots but tread taller, shorter on the rears, Just curious if anyone here has had tires do that ( create a vibration) that comes and goes , or does this sound like a differential / Tranny /Transfer Case Problem, like I said it comes and goes, It seems like it depends how much throttle you givin it the easier the smoother, the more , more vibration, I am baffled, I will be checkin the u joints in the morning, I am almost convinced there is a balance /mounting issue with the drive shaft, but not sure. any help is appreciated



2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has answered 20 questions.

  • Expert
  • 33 Answers

I would check the rear trans mount at the rear of the trans first. Put a pry bar between the trans and the big metal cross member and see if the rubber of the mount separates from the metal. Replace if necessary. The extension housing usually has a bushing inside as you suspected. They do wear out. It rides against the slip yoke of the driveshaft. If the rear trans seal is leaking that usually indicates a worn bushing inside the housing. It's not that hard to replace on most vehicles. Replace the bushing and seal. Replace the gasket between the trans housing and extension housing. Make sure the slip yoke on the driveshaft is not worn out or that will need to be replaced too.

Posted on Feb 05, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 1,902 Answers

Yes you can rebuild the tailshaft and there are bearings inside of is. Does the yoke seem to be smooth looking meaning no major marks?

Posted on Feb 05, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My 2003 GMC Jimmy has excessive vibration when accelerating hard or at speeds of over 80 km/hr - 50 MPH. Could this be a u-joint issue?

If the vibration is in the steering wheel, and you are in 2wd then chances are it is not you're u-joints. I would get other car on a Lift, check ball joints and steering linkage for play. You may jut need to balance your tires

Oct 20, 2013 | Cars & Trucks

2 Answers

94 Ford Taurus popping noise on hard acceleration

What about the CV joints or the splined shaft that goes into the hub ?

Jul 05, 2013 | 1994 Ford Taurus

1 Answer

I have a 1998 chevy 1500 it has a viberasion at about 65 the drive shaft has a little play in it were it comesout of the transfercase how can i fix it

Alittle play is normal, what i would do is remove the driveshaft and check the ujoints, a bad or frozen joint will cuase a vibration, this is a common problem i would start with that and maybe you will find a bad ujoint. good day.

Aug 28, 2011 | 1998 Chevrolet K1500

1 Answer

I have GMC Envoy 2004 model. since few days i have notice that if i drive in a speed more than 100 KMPH, there is a slight vibration. please advise what could be the reason...

possibly a bad u-joint. Sometimes a u joint will feel ok but if it is too tight it can cause a vibration. you will need to remove the shaft to feel if a joint is too tight and binding. Or you have a tire out of balance. Usually a driveline vibration is more of a buzzing high frequency type of vibration the kind that puts your foot to sleep and a tire is more of a wheel speed vibration which is a lower frequency vibration.

May 02, 2011 | 2004 GMC Envoy

1 Answer

Theres play in my front drive shaft. I dont know if its the u joint or the rear end going into the transfer case. what is the most in expensive way to fix problem. problem is when braking accasionally feel...

the cheapest way would be to remove the front driveshaft I guess... This will give you opportunity to inspect the Ujoints too!
If it is only a Ujoint... you can replace the Ujoint and shaft when you have the money to do so...

Sep 28, 2010 | 1992 Ford Explorer

4 Answers

2005 gmc seirra vibration around 50 mph

It sounds like a bad U-joint to me. The only way to properly check u-joints is by removing the driveshaft. The joint should move freely, any binding will cause the vibration.

Mar 28, 2010 | 1995 GMC Sierra C1500

1 Answer

1998 isuzu trooper vibration problem under load. Tires were just balanced and rotated. It has been getting worse over the last 2 months. New ujoints on the drive shaft. Still has a vibration when...

I would next check the condition of the engine, transmission and transfer case mounts. The mounts all have rubber inserts in them to absorb vibration and if the rubber starts to deteriorate or drycrack it can cause a vibration, especially under load.

Nov 22, 2009 | 1998 Isuzu Trooper

1 Answer

93 chevy trans

they used 2 different transmissions eighther a 4L60E,or a 4L80E you can usualy tell by the amount of bolts in the pan check with local autoparts dealer for exact number each has

Jan 14, 2009 | 1993 GMC Suburban

2 Answers

Vibration at 60 and 70 mph

Start by inspecting your tires. Look at tire ware, any tire separation (bubbles). Look at you wheels to see if you lost any wheel weights. Look at your driveline, wiggle it at the Ujoints to make sure they are tight. These are good starting points.

Jul 12, 2008 | 1999 Chevrolet Silverado 1500

Not finding what you are looking for?
1990 GMC Suburban Logo

252 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

77947 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides