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Discussion Starter #1
Will a 4 wheel alignment show if the rear diff is or isn't centered in the car?
 

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It is called "thrust angle".
 
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Thrust angle tells the angle of the rear axle compared to the front axle. It tells which direction (angle) the rear tires are pushing (thrust) the car. This doesn't tell you how centered the rear tires are left to right within the car.

To find that, you need to make sure that the alignment tech prints out secondary or advanced alignment data. You are looking for the Geometric centerline offset value. That tells you if the rear axle is offset to one side.
 

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Discussion Starter #8
Thrust angle tells the angle of the rear axle compared to the front axle. It tells which direction (angle) the rear tires are pushing (thrust) the car. This doesn't tell you how centered the rear tires are left to right within the car.

To find that, you need to make sure that the alignment tech prints out secondary or advanced alignment data. You are looking for the Geometric centerline offset value. That tells you if the rear axle is offset to one side.
Thanks Jack. That's just the info I needed.
 

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I need to clarify. I'm talking about side to side alignment and not front to back. In the Jeeping world we used adjustable track bars when lifting the vehicle.
 

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UCA’s will move axle left and right. LCA’s will move it front to back.
 

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UCA’s will move axle left and right. LCA’s will move it front to back.
Ok. I really didn't think the UCA's would have that much effect but then again; most cars probably aren't off that much.
 

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UCA’s will move axle left and right. LCA’s will move it front to back.
Ok. I really didn't think the UCA's would have that much effect but then again; most cars probably aren't off that much.
If you draw it out with the angle of the suspension movement, it will make sense. Once you get under there and start adjusting them, you’ll see the movement. Small adjustments and many measurements.
 

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Discussion Starter #16
UCA’s will move axle left and right. LCA’s will move it front to back.
Ok. I really didn't think the UCA's would have that much effect but then again; most cars probably aren't off that much.
If you draw it out with the angle of the suspension movement, it will make sense. Once you get under there and start adjusting them, you’ll see the movement. Small adjustments and many measurements.
Thank you. I still need to measure the diff location and go from there. I have way too much time on my hands. Lol
 
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