Rear Axle Thrust Angle

Suspension, Steering and Chassis

  1. mopowers

    mopowers Well-Known Member

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    When aligning a rear axle so it's perpendicular with the car, what is generally accepted as the maximum amount of thrust? Would being within 1/8" from side to side at the ends of the axle be acceptable?
     
  2. TrailBeast

    TrailBeast Slightly Twisted Member

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    AKA known as centerline thrust.
    1/8 should be WAY fine, and they were much farther off than that right out of the box.:D
    Personally I try to pay more attention to weather the car tracks straight, instead of looking like it's going down the road sideways.
     
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    • mopowers

      mopowers Well-Known Member

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      That's sort of what I was thinking. How much does it need to be off for it to look like it's tracking sideways? I have no frame of reference. Thanks again.
       
    • TrailBeast

      TrailBeast Slightly Twisted Member

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      About the only effective way I know of is to have someone follow the car, or have someone else drive it while you follow and check it.
      That said, I don't think 1/8 would even be noticeable.
       
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      • mopowers

        mopowers Well-Known Member

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        Me neither. Thank you.
         
      • RustyRatRod

        RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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        Thrust angle is a comparison of the angles of the center line of the axle to the center line of the vehicle, from front to rear, so the sides of the axle really have nothing to do with it. 1/8" is plenty acceptable for a street car, but of course, like everything else, if you are building a race only badass, you want it as perfect as possible.

        Like Greg said though, a LOT of cars are riding around with way more thrust angle than 1//8".
         
      • famous bob

        famous bob mopar misfit

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        RRR is right. I made mine perfect w/ an 1/8" shim, can`t tell the diff.!
         
      • oldkimmer

        oldkimmer FABO Gold Member FABO Gold Member

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        Put it on a 4 wheel alignment machine and it will tell u where it is at and if it is acceptable. I had a d60 shortened and welded ends on it and the thrust angle is 0,when checked on the alignment machine. Kim
         
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        • Abodybomber

          Abodybomber Breaking street machines , since 1983.....:) Legendary Member

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          Kimmer,someone did it right...
           
        • oldkimmer

          oldkimmer FABO Gold Member FABO Gold Member

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          He sure did.I was surprised it came out that good as we used ends off of a C body 8.75. Kim
           
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