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  1. #1

    Default drive shafts?

    we have 2001 chev 6.6 crew cab short box. I expect the vibration I feel is from a U-joint. I have checked both the main and 4x4 drive shafts. The front one has a U-joint gone, would this cause the vibration when in 2x4 and if so are the U-joints the same in both drive shafts?
    2001 Chevy silverado 2500HD 4x4, crew cab,5-speed Allison, 6.6 Duramax

  2. #2
    Join Date
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    When is your vibration? Is it at launch? Does your truck have a two piece steel driveline or a one piece aluminum driveline?
    1998 Chevy k-2500 454 147,000 miles and climbing!

    1993 Pontiac G/A Big Block 3.3 Liter 140,000 miles and still going too!

  3. #3

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    no it doesnt seem to be at launch, when I am moving but more when pulling a trailer. it has the two piece steel, but I do know that there is a U-joint gone in the front drive shaft that goes from the transfer case to the front, not sure if there is one gone in the main driveline
    2001 Chevy silverado 2500HD 4x4, crew cab,5-speed Allison, 6.6 Duramax

  4. #4
    NutNbutGMC Guest

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    Quote Originally Posted by Horse_gal_jen View Post
    no it doesnt seem to be at launch, when I am moving but more when pulling a trailer. it has the two piece steel, but I do know that there is a U-joint gone in the front drive shaft that goes from the transfer case to the front, not sure if there is one gone in the main driveline
    The two-piece shaft is a known culprit for low-end shudder. There is / was a TSB for the replacement of said shaft. I had mine (2-piece) replaced on a 2001 model and it makes a difference and resolves the issue. One thing to be aware is that there is a certain way to remove / replace the shaft. When the bulletin first came out in 2001 there apparently were no specific removal/reinstallation instructions and some shop techs were cutting the cross-piece on the frame. Do not allow this. There are specific instructions against this. Just a reminder and a checkpoint before the fact and not after.

    The problem is the center carrier joint. Apparently there is too much of an angle in the drive component, thus the one-piece (and much larger) shaft.
    Last edited by NutNbutGMC; 04-30-2009 at 18:42.

  5. #5
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    Jen:

    No, the front shaft should not be moving in 2WD, so that is not the problem. If you have the 2 piece drive shaft, and I suspect you do, that that is likely the culpret.
    The Constitution needs to be re-read, not re-written!

    If you can't handle Dr. Seuss, how will you handle real life?

    Current oil burners: MB GLK250 BlueTEC, John Deere X758
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  6. #6
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    As I recall, there was/ is a trade off. Updating to the one piece driveline got rid of the launch shudder BUT you ended up with a high speed vibration. It has been a while since we have had any dealings with this complaint.
    1998 Chevy k-2500 454 147,000 miles and climbing!

    1993 Pontiac G/A Big Block 3.3 Liter 140,000 miles and still going too!

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