Question about 1990 GMC Suburban

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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.

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  • 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

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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

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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

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