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fixed, please delete

Discussion in 'The Garage' started by JEBSR, Mar 12, 2005.

  1. JEBSR

    JEBSR 1/2 ton status

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    I know this subject is all to common but there is something I'm not sure about that I could use some help with. Just pulled the 12 bolt out of my 87 blazer and I am putting in a 14 bolt ff from an 86 k-30. I cut the perches off and loosly bolted the diff in with all weight on the diff in order to get springs loaded to measure pinion angle. My transfer and pinion are perfect but it and looks to be close to the old marks(where perches were previously mounted) but when I put an angle finder on the driveshaft the angle is right at 30 degrees downward. The only changes I made during the axle swap was pulling the 6" skyjacker blocks and installing 6" skyjacker springs. Axle angle was much less with the 12 bolt with no vibrations. Any ideas? Am I doing something wrong?:confused:

    ps. can't afford a cv after purchasing the 1 tons for know so what do I do with this setup?
     
    Last edited: May 3, 2005
  2. 85mudblazin

    85mudblazin 1/2 ton status

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    get a pic and we can help ya out better.
    If you dont have a CV then you angles should be parallel meaning the output at the T-case should be running parallel with the axle pinion.
    Some thing like this _
    /
    -
     
  3. readymix

    readymix 3/4 ton status

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    [​IMG]

    This should cover the angle measuring part
     
  4. JEBSR

    JEBSR 1/2 ton status

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    My angles are correct as in the picture my concern is overall angle of shaft (almost 30 degrees). I'll go take a pic real quick and show you what I mean.
     
  5. JEBSR

    JEBSR 1/2 ton status

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    driveshaft angle

    here are 3 pics. Hard to see but angle of transfer and diff are identicle. Oh yea ignore the stands, the truck isn't touching them.

    PANA0055.JPG

    PANA0056.JPG

    PANA0057.JPG
     
  6. Jonny-K5

    Jonny-K5 1/2 ton status

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    ya thats a pretty big angle. do you have you Tcase shimmed down already?
     
  7. JEBSR

    JEBSR 1/2 ton status

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    about 1 inch. Just don't understand why the differance between using the blocks and the springs. Was working fine before with not neer the angle.
     
  8. Stomper

    Stomper ΜΟΛΩΝ ΛΑΒΕ GMOTM Winner

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    Drive shaft looks way short to me:confused:
     
  9. big pappa b

    big pappa b 3/4 ton status

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    How much of the yoke is in the T-case?
    That does look a little steep on the u-joints. Might have a little vibration.
    The spring perches on the 12 bolt were most likely in a little different location than those on the 14B
     
  10. big jimmy 91

    big jimmy 91 1/2 ton status

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    Sorry to hijack but...

    Is there an information source that explains drive shaft angles in detail?
    Being new to modifying / lifting trucks it seems a bit confusing to me because I am unsure of where the angles are taken from and under what conditions

    Any help would be appreciated , thanks in advance

    BTW yes I have searched but after reading through lots of posts I still am unsure about it

    Bump
     
  11. big pappa b

    big pappa b 3/4 ton status

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  12. JEBSR

    JEBSR 1/2 ton status

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    driveshaft angle

    I have about 2-2.5" in the transfer housing. I know it's a little short and I plan on getting a cv shaft later. I am afraid that if I weld the spring perches on with these measurements I may have to change them when I get a cv shaft.


    here is the sight I got my info on http://www.pirate4x4.com/tech/billavista/PR-shaft/index2.html
     
  13. big jimmy 91

    big jimmy 91 1/2 ton status

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    Thank you very much:thumb: This will make for some interesting reading tonight (May even be able to grasp it now lol.)
     
  14. xtrmjoe

    xtrmjoe 1/2 ton status

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    If that is the stock shaft the splines do not go all the way to the end of the slip yoke, therefore you need a longer shaft for the splines to have enought contact to move the rig foreward. Are you sure you have that much slip yoke in the t-case? From the pick it looks like you would be lucky to have and inch.
     
  15. JEBSR

    JEBSR 1/2 ton status

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    driveshaft angle

    It measured just over 2, but your still right it's really too short, just trying to get it out of shop to move to new location. Probrable just need to wait and get a cv shaft instead of breaking it trying to half@#s fix it.
     
  16. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    You are going to have to reweld when you get your CV shaft later . With a CV you basically point the pinion straight at the transfercase . Maybe down a degree or two to account for axle windup when your driving .

    I got about perfect with stock perches and shackle flip , doesn't vibe at this angle , I never measured but it looks down just a hair so its perfect driving :k5: :k5:

    [​IMG]
     
  17. JEBSR

    JEBSR 1/2 ton status

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    driveshaft angle

    Well thanks for comfirming and giving additional infor on this. Uncle Sam pays my in 3 days so I guess I'll just bite the bullet and order a new cv shaft so I only have to weld once and do it right the first time.;)
     
  18. Hossbaby50

    Hossbaby50 3/4 ton status

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    Questions for you.

    In this picture is the truck supported by the jackstands only? Is the axle drooped all the way down? Or is the weight of the truck on the axle?

    http://coloradok5.com/forums/attachment.php?attachmentid=2024&stc=1

    If the weight of the truck is on the axle and this is ride height you will need a new driveshaft. That driveshaft is almost bound up as it sits. The first time you flex the truck out it will bind the driveshaft and the driveshaft will break.

    I did some grinding on my stock driveshaft to get a little more angularity out of it but during my tests I drooped the axle down and the driveshaft ujoint will bind up at not much more then that.

    If that picture of the driveshaft is with the axle all the way drooped down then you can probably run that driveshaft for awhile. Just spin the tires with the truck in neutral and see if the ujoint is bound up. If it is then you need to limit the suspension of get a new driveshaft.

    I had to end up limiting my maximum droop of the axle so that it would not bind if the rear axle was allowed to flex all the way down. If you bind up a driveshaft ugly things will happen. Don't ask me how I know.

    Harley
     
  19. JEBSR

    JEBSR 1/2 ton status

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    driveshaft angle

    The stands are just sitting there from when it was in the air, they actually are about an inch below the frame. Weight is on the axle.
     
  20. Jonny-K5

    Jonny-K5 1/2 ton status

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    blocks might have had a taper cut to them. the 14b is 1" longer than a 12b IIRC, so it makes the distance between ujoints that much closer, which hurts angle even more. probly a combination of the two.
     

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