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#1 |
Registered User
Join Date: Apr 2007
Location: MOOSIC PA
Posts: 62
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What is the Angle Between the Trailing Arms
Hi All. I'm looking to see if someone knows what the angle is between the trailing arms on the 60-72 trucks.
I'm looking to draw up some axle perches to be cut and bent so I can use a Dana 60 on my next project, but I don't want to open up a set of perches with a grinder to fit the larger axle tube. |
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#2 |
Registered User
Join Date: Jun 2013
Location: Somewhere
Posts: 3,073
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Re: What is the Angle Between the Trailing Arms
Maybe there's an easier way, but this nonsense is what comes to mind
![]() If you can get some precise measurements of distance it would be easy to calculate. The trouble is precision w/ an old truck. Picture looking down from above at the trailing arm in place. Think of the slash / as the arm. There's a certain distance vertically and one horizontally to make a right triangle /_|. If you can get those lengths, the rest can be calculated. Do the same for the other side and add the 2 together to compensate for a bent frame if needed. Maybe the bigger "pic" is more clear. The vertical line is the frame, the angled one the arm, and the bottom the axle. /| / | /__|_ Something like sine(Diff/Frame) will give the angle between the frame and the arm. My math is rusty so don't trust me. |
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#3 |
Registered User
Join Date: Jun 2013
Location: Somewhere
Posts: 3,073
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Re: What is the Angle Between the Trailing Arms
Might need to add some spaces or remove underscores to make that look like a triangle...
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#4 |
Registered User
Join Date: Apr 2007
Location: MOOSIC PA
Posts: 62
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Re: What is the Angle Between the Trailing Arms
I went out to the roller I'm planning on using and took some rough measurements going off of the centerline of the trailing arms. Using the rough measurements I made, and drawing them up I got an included angle of 31.43°. I don't think the engineers at GM would go with an odd number like that, so I'm thinking that a 30° included angle is what they're supposed to be.
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