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Need Some Help (Drive line "Chatter")

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 77JimmyMan, Dec 10, 2001.

  1. 77JimmyMan

    77JimmyMan Registered Member

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    Need Some Help (Drive line \"Chatter\")

    I recently just installed a 4" suspension lift in my 77' GMC Jimmy. I had the rear shaft lengthened 2 1/4". I didnt drop the transfer case(NP203) down, it said (the instructions) that it wouldnt have to be done unless it was a newer model. Now for my problem; when you mash the gas you can see the shifter for the transfer case wobble back and forth pretty hard and theres this clunking noise. Im not sure what would cause this. The mounts all seem to be in good shape. Is it possible that the drive shaft is at too steep of an angle? There doesnt seem to be any binding, it spins freely by hand, but that could be a different story when the power is applied. If I lower the transfer case, will it screw up the motor mounts, possible cause fan to shroud clearence problems, or cause the distributer to hit the firewall? I really hope you guys can help, snow finally fell sunday and the good weather has begun to turn, not to mention that its damn cold outside and my Firebird is hogging the garage. Oh ya all the U-joins have been replaced, wheel joints have been too. And Im running 33" tires if it helps. Thanks
     
  2. 2Dogs

    2Dogs 1/2 ton status Premium Member

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    Re: Need Some Help (Drive line \"Chatter\")

    Was it balanced when you lengthened the DL?

    My vibes were 95% worn out yoke on the rear. Check the yokes and make sure they are tight.

    Have you had someone measure the angle on the pinion shaft?

    Dave

    Horn Broken... Watch For Finger.
    <a target="_blank" href=http://coloradok5.com/gallery/Daves-Pics>http://coloradok5.com/gallery/Daves-Pics</a>
     
  3. 77JimmyMan

    77JimmyMan Registered Member

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    Re: Need Some Help (Drive line \"Chatter\")

    The shaft was balanced. The yokes shoud be tight, this problem never happened before the lift. As far as the pinion angle goes, it was never measured. Could that possible be the problem, to steep of an angle? Im open for any possible fixes.
     
  4. BigTex

    BigTex 1/2 ton status

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    Re: Need Some Help (Drive line \"Chatter\")

    Do yourself a favor and lower the T-case. It eliminated a seriuos case of vibrations on my truck. Now if only I could find out where the other vibrations are coming from...But seriously, it is very easy and it may cure your problem.

    <font color=red>"SETTING OFF ALARMS IN A CITY NEAR YOU!"</font color=red>

    &lt;a target="_blank" href=http://coloradok5.com/gallery/BigTex-Mean-Machine&gt;http://coloradok5.com/gallery/BigTex-Mean-Machine&lt;/a&gt;
     
  5. 2Dogs

    2Dogs 1/2 ton status Premium Member

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    Re: Need Some Help (Drive line \"Chatter\")

    Does lowering the transfercase help or hurt the front angle.....?

    Dave

    Horn Broken... Watch For Finger.
    <a target="_blank" href=http://coloradok5.com/gallery/Daves-Pics>http://coloradok5.com/gallery/Daves-Pics</a>
     
  6. BigTex

    BigTex 1/2 ton status

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    Re: Need Some Help (Drive line \"Chatter\")

    I does affect the front driveshaft angle, but not enough to hurt it. I really didn't lowering the T-case would do much, so I put it off, but one day I decided to do it and I was very happy with the results. I'd say try it and see if it helps. It is very simple, your truck should already have the factory spacers there.

    <font color=red>"SETTING OFF ALARMS IN A CITY NEAR YOU!"</font color=red>

    <a target="_blank" href=http://coloradok5.com/gallery/BigTex-Mean-Machine>http://coloradok5.com/gallery/BigTex-Mean-Machine</a>
     
  7. Blue85

    Blue85 Troll Premium Member

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    Re: Need Some Help (Drive line \"Chatter\")

    You can get an "angle finder" gauge at home depot or Sears for 7 or 8 dollars and it will tell you what you need to know about your driveline. If you don't know what the angles are, you don't know yet whether or not you should suspect something else. And then you will use this gauge again and again whenever you do suspension or driveline changes.

    <font color=green>Oh man, 4:10's are sure better than 3.08's!</font color=green>
     
  8. 77JimmyMan

    77JimmyMan Registered Member

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    Re: Need Some Help (Drive line

    Yesterday I lowered the T-case and installed new mounts. I only got to drive up and down my street (about 100 yards long) due to time limitations. The vibration and clunking sound seem to have magicaly gone away when you mash the gas. Thanks
     
  9. BigTex

    BigTex 1/2 ton status

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    Re: Need Some Help (Drive line

    Awesome! I'm glad things worked out. See how bada$$ this board is?[​IMG]

    <font color=red>"SETTING OFF ALARMS IN A CITY NEAR YOU!"</font color=red>

    <a target="_blank" href=http://coloradok5.com/gallery/BigTex-Mean-Machine>http://coloradok5.com/gallery/BigTex-Mean-Machine</a>
     

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