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Caster angle

Discussion in 'The Garage' started by mudjunkie 82, Jan 4, 2005.

  1. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    I need to rotate my front 60 for a better pinion angle, Does anyone know the most you can go before it really effects caster angle? my caster is 7 degrees right now. Thanks for any info
     
  2. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    id like to know also
     
  3. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    Where is Tim when you need him:confused:
     
  4. BAJA_BLAZER

    BAJA_BLAZER 1/2 ton status Author

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    Who needs him?:D

    For every degree you rotate the axle you change the caster the same amount. 7 degrees is in the ballpark.

    When you turn the steering wheel, the front wheels respond by turning on a pivot attached to the suspension system. Caster is the angle of this steering pivot, measured in degrees, when viewed from the side of the vehicle. If the top of the pivot is leaning toward the rear of the car, then the caster is positive, if it is leaning toward the front, it is negative. If the caster is out of adjustment, it can cause problems in straight line tracking. If the caster is different from side to side, the vehicle will pull to the side with the less positive caster. If the caster is equal but too negative, the steering will be light and the vehicle will wander and be difficult to keep in a straight line. If the caster is equal but too positive, the steering will be heavy and the steering wheel may kick when you hit a bump.
     
  5. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    but how much can you rotate it without it wondering to much?
     
  6. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    Ditto??????????????????????????????????????????????????
     
  7. BAJA_BLAZER

    BAJA_BLAZER 1/2 ton status Author

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    I set the race truck up with 8* caster. I don't know the factory specs off hand, but could look them up at home if no one else knows them. I would think 6* would be optimal and 2* would be sketchy at best. Get yourself (borrow) some caster shims and install them to try different settings before you do any cut ‘n turnin’. You’ll know when you have gone too far.
     
  8. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    im pretty sure the factory caster is 8*

    i need a 6* shim to get my pinion angle right, but have been thinking about going with a 4*
     
  9. az-k5

    az-k5 1/2 ton status

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    What is the best way to measure the castor you currently have? I assume an angle finder will work but where do you place it?
     
  10. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

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    Yes 8* is correct. I looked it up when I had my knuckles put on.
     
  11. divorced

    divorced 3/4 ton status

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    :ears: :ears: :ears:
     
  12. readymix

    readymix 3/4 ton status

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    AFAIK, You can not accuratly measure caster ange in your garage unless you have an alignment rack. It has to do with the steering inclination angle (SIA) and the changes encountered when you turn the wheels.

    I could be wroung though as it has happened before. If anyone knows a way to do it i will buy you a beer or three for telling me.
     
  13. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    the only way i know is to remove the knuckle and get a bar to just fit inside the holes for the ball joints and stick a angle finder to it. youll also have to account for the angle of the entire truck.

    its alotof work just to measure that, but it should work.
     
  14. divorced

    divorced 3/4 ton status

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    Maybe I'll just take my $40 to the alignment shop and see. They can set my toe then too. :D
     
  15. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

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    A top the knuckle
     
  16. cybrfire

    cybrfire 1 ton status Vendor GMOTM Winner

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    From what I understand 4* positive caster is the least you should ever have. Don't quote me on this as it is hear say. I know there are lots out there that have less caster than that.


    Don't try to flat tow anything with much less than that. It just don't work.
     

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