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drive shaft out of wack!!!!

Discussion in 'The Garage' started by CRAZEDHICK3, Aug 7, 2002.

  1. CRAZEDHICK3

    CRAZEDHICK3 Registered Member

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    Just installed 6"lift(all springs)on my 90 Jimmy. getting a bad vibration 25mph-45mph. Looking at the back of the truck to the drive shaft, i can see that the shaft goes at an angle to the left to the transfer case. Is this right? If not, how do I fix??? Thanx
     
  2. jc71355

    jc71355 1/2 ton status

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    You mean the T-case and Axle are not exatly inline and the shaft doesn't go exactly perpendicular to the axle? If you just changed springs that shouldn't be the problem. I don't think that they are exactly inline. I would think that your pinion needs to be turned up with shims if you haven't done this. You probobly also need to drop your T-case or get a C/V style drive shaft to correct the angle. Hope this helps.

    James
     
  3. TopOff

    TopOff 1/2 ton status

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    Reading driveshaft tech articles.

    "In order for a two u-joint driveline to be free of vibration it must be in balance, and the angle of the front u-joint must be the same as, or very close to, the angle of the rear u-joint. If there is a noticeable difference in the angles there will be a vibration."
    - Randy's Ring and Pinion
    found
    http://www.4x4now.com/gt0899.htm

    Also check out www.4xshaft.com click on TECH INFO.

    A two piece (as in our rear driveshafts) should be parrallel.
    A CV type driveshaft (as in our fronts) should indeed have the pinion pointing up.
     
  4. jc71355

    jc71355 1/2 ton status

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    Sorry I'm confused. I don't know if he meant the outputs where not in line or if the shaft was bent. I'm just confused /forums/images/icons/crazy.gif .
     
  5. TopOff

    TopOff 1/2 ton status

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    Hmmm, maybe...

    My rear axle is not straight to my transfer ....looking from rear to front. Maybe that's what he means.
     
  6. drivelineman

    drivelineman 1/2 ton status

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    you have an angle problem - you need a c/v to fix it- Jess
     
  7. Chaz88K5

    Chaz88K5 1/2 ton status

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    you might get way without runnin a C/V shaft...just play with the angles on the rear joint by adding shims...and since you have a 90 you can get a SYE kit...and get rid of the slip yoke all together /forums/images/icons/grin.gif if all else fails then go for the C/V..
     

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