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that splains a bunch

Discussion in 'Early CJ5 and CJ6 Tech' started by bkd, Apr 30, 2008.

  1. Apr 30, 2008
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    After swapping in the new D30 into my 6 it's been a little twitchy on the road. Camber looked like it might be off (+) a bit, but using a square on my garage floor it measured dead on. I took it in today to have it aligned....results.....1degree positive camber, 2.6 degrees positive CASTER ( thats w the 5 degree shims McRuff made for me installed). Guess I'll be adding more shims for the caster issue, the shop is handling the camber
    BOY IT NEVER ENDS:rofl: :rofl:
    Jim S.
     
  2. Apr 30, 2008
    trickpatrick

    trickpatrick Done? LOL

    North Idaho USA
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    Did the shims go in backwards??

    And Camber is not adjustable is it?

    Just thinking out loud.
     
  3. Apr 30, 2008
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    shims are in big end facing the front(same shims pulled from the D30 I replaced)....camber can be adjusted a few ways, the shop is using a wedge kit that attaches to the top ball joint. Not sure why the caster came out like it did....maybe the perches are not stock?, or from some other application. McRuff is making new shims for me so should have all issues rectified by mid next week.
    Thanks :beer:Jim S.
     
  4. Apr 30, 2008
    trickpatrick

    trickpatrick Done? LOL

    North Idaho USA
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    838
    Seems a bit strange.
    What angle is the pinion at now?
    Will adding more shim point the pinion down to much?
     
  5. Apr 30, 2008
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    I can get those answers in a few hours :)
    thanks, Jim S.
     
  6. Apr 30, 2008
    drexotic

    drexotic Happy now?!?!?

    San Diego
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    Jan 7, 2007
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    One cause of positive caster is long front shackles. You might get a degree or two by shortening your shackles.
     
  7. Apr 30, 2008
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    Yea but everything stayed the same when I swapped 1 D30 for the other D30....same shackles/springs/shims/etc. I really don't want to change anything equipment wise. I'm picking up the 6 in a little while, I'll check the pinion angle then.
    Thanks, Jim S.
     
  8. Apr 30, 2008
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    so after getting the 6 back from the shop I put the angle finder on the diff.......it's at 6* above level (angled up)....adding 2 1/2* more + caster shouldn't cause any problems, correct?
    thanks,Jim S.
     
  9. Apr 30, 2008
    trickpatrick

    trickpatrick Done? LOL

    North Idaho USA
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    838
    So why is this axle tilted so far forward?

    I know it's more work but it would seem that you might want to cut off the spring perchs and start over.

    Seem's without looking at it that they were put on in the wrong spot.
    Would be better than big wedges.
    Almost like having a block in there.

    just trying to help you think it through.

    I am sure you already know how .
    But you could cut them off buy new ones and put it together without welding them in place then twist it back to 5 to 7 degress and then spot weld them and take it apart to weld up.

    Im not an expert but thinking this would help the camber too.
     
  10. May 1, 2008
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
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    So what is the angle on the diff:? supposed to be?
     
  11. May 1, 2008
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    don't know for sure but I would assume close to level/ 0*

     
  12. May 1, 2008
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
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    You should be OK with the shims. After swapping out the stock D27 in my old '71 for a '74 D30 that I rebuilt... alignment shop told me I had 1 degree positive caster. Rig was uncontrollable over 30 mph.
    I added 5* shims, fat end forward of course, giving me a total of 6 degrees positive caster. Rig drove perfect after that. Wheeled it pretty hard too, The wedge/shims were never an issue.

    I gave no concern to the front pinion angle. It was OK, and for the relatively low-speed work it would do, I considered pinion angle a non-worrier. :D
     
  13. May 1, 2008
    trickpatrick

    trickpatrick Done? LOL

    North Idaho USA
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    838
    Under load the pinion will tilt up a bit.

    Seems that a degree or 2 down is a good spot to aim for.

    Mine is at 0 pinion with 7 degrees castor but havnt driven it yet.
     
  14. May 1, 2008
    double R

    double R Member

    Reseda, CA
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    i'm curious and confused, wouldn't you want the big end of the shim facing the back to tilt the knuckle towards the back?
     
  15. May 1, 2008
    80cj

    80cj Member

    Hawaii
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    Is your Jeep sitting at an excessively tail high attitude? Yhis will affect caster. The +1 degree camber is good. You'll get good tire wear.
     
  16. May 1, 2008
    80cj

    80cj Member

    Hawaii
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    For positive caster, you want the top of the steering knuckle tilting toward the rear. So for a stock spring under axle application, the thick end of the shim faces forward.
     
  17. May 1, 2008
    double R

    double R Member

    Reseda, CA
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    got it...i was mistakenly imagining spring over, thanks
     
  18. May 2, 2008
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
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    In the rear that's true. In the front when going forward the pinion tilts down under load.
     
  19. May 2, 2008
    trickpatrick

    trickpatrick Done? LOL

    North Idaho USA
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    I have to quit posting for awhile I am working to hard no brain power left.:):rofl:
     
  20. May 15, 2008
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    so in order to get 5* positive caster I needed bigger shims, Mike (Mcruff) made them for me and as usual very nice quality...old on left...new on right
    [​IMG]
    I installed them last night. Wow what a few degrees makes! I was cruzin at 50-55mph steering w/ a knee this morn on the way to work. Big props to the knowledge base on this site :beer:
    Thanks, Jim S.
     
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