2001 Chevy S-10 Vibration 20mph - 27mph

Tiny
JTHAMLIN
  • MEMBER
  • 2001 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 99,000 MILES
2001 s-10. All factory, no updgrades or additions. U-joints and carrier bearing were replaced last week. Brakes are good, tires are new and balanced. Ever since we replaced the u-joints last week I've had a bad vibration from 20mph-27mph. It runs very smooth before and after. I spoke w/ a mechanic buddy and he suggested replacing the busing in the tail shaft of the transmission. I plan to do so because I have been leaking tranny fluid ever since replacing the u-joints so I suspect it is bad. But I do not believe it would cause the vibration. Any other thoughts or ideas?
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Tuesday, October 27th, 2009 AT 10:41 AM

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Tiny
MHPAUTOS
  • EXPERT
HI there,

Thank you for the donation,

With 2 piece tail shafts they are normally phased that is set up in balance and if the two shafts are not re aligned as they were first assembled a vibration can often take place, now as I am in Aust and I don't see these cars, I am just working on the premise that it is a two piece shaft and it has been dismantled and may not have been match marked? Is this the case? If so there may be matching balance marks to aid in re assembling so the phasing is correct, check this out and let me know what you find, I will be away for a few days so I wont have access to Mitchell 1 for any tech information till I return, check the transmission bushing and also the carrier bearing alignment as well.

Mark (mhpautos)
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Wednesday, October 28th, 2009 AT 7:48 PM
Tiny
JTHAMLIN
  • MEMBER
Thanks for the response!

Yes, it is a 2pc drive shaft. We dismantled it to replace the u-joins and the carrier bearing. I will check again to make sure it was aligned properly. Maybe I should take the shaft in to be checked and balanaced? Your thoughts?

I will have my local tranny shop replace the bushing because it's not a project I feel confident taking on.
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Thursday, October 29th, 2009 AT 8:57 AM
Tiny
MHPAUTOS
  • EXPERT
Good idea on both counts, have a look at the shaft and also check for any missing balance weights, they are small, but it may have thrown one.

Mark
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Thursday, October 29th, 2009 AT 9:21 AM

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