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Old 04-06-2009, 02:53 PM
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new springs & hangers on a 51chev frame

I have a 51 long wheel base frame and bought spring hangers and springs. i want to measure and mount the hangers, question is at what angle is the spring shackle positioned at, to the frame? Is it 90 degrees from frame or what angle?

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Old 04-07-2009, 10:42 PM
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The way I figure it, the longest the spring will ever be is when it is flat. With this in mind, measure along the main leaf from the center line of the front eye to the center line of the rear eye. If you run the tape measure along the curve of the spring, you will get the overall length when it is flat.

Then, measure back from the front spring mount center line toward the rear keeping the tape measure tight. With a square held up under the frame, position it so it lines up with the max spring length at about the length of your shackle, and mark the frame at that point. Now, make a mark on the frame forward (toward the front of the truck) about half the distance the shackle is long. For example, if you have a 4" long shackle, mark the frame 2" forward. That should put the shackle nearly vertical when the truck is at ride height.

For extremely curved springs or if the shackle goes through the frame instead of under it, you may decide to adjust the hanger position slightly one way or the other to maintain clearance.

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