Lowering just the rear of an 84 c10

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78C10BigTen

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I could have been right. Lol

He said he uses it for work, and wanted to lower the rear 2". Tell me that doesn't say squat to you. Lol
Lol maybe. I have reverse sqat, im way low in the front and ass high. I plan on BB coils when i do my 6 lug rotor conversion though
 

MikeB

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ok drop shackle it is. once the height is set I will measure for a new shock or get extensions for the stock ones.

If you drop only the rear of the leaf springs, the pinion yoke will be pointed downward a little more, so you might want to consider pinion shims. On my 82 C10 I installed dropped hangers, but not shackles, and had to use 4 degree shims to get the driveline geometry correct.

Also, if not mentioned above, you will have to notch a bed floor support to clear the longer shackles. Something I wouldn't try unless the bed was upside down in my garage.

https://www.speedwaymotors.com/Leaf-Spring-Pinion-Angle-Shims,3354.html
 

MikeB

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If you only use a drop shackle you only lower one side of the spring, effectively cutting your drop in half. 2" drop shackle is actually 1" of measured drop.

I have not played with drop shackles in many years but that's how I recall it going down.
Well, most "dropped" shackles raise the rear spring eyelet by 3.5" - 4.0", which equals 1.75" - 2.0" at the axle.

So, 2" dropped shackle actually means 2" at the axle.
 

wixthedog

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That could be the confusion, back when I was using shackles I was lifting - not lowering!
 

Brett77

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I agree with Bluex just make sure you notch the bed crossmember at rear where hanger goes it will clear sitting but will rub as drive.
 

MikeB

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That could be the confusion, back when I was using shackles I was lifting - not lowering!
I remember those days, when it was popular to jack up cars in the back. And sometimes using longer shackles to compensate for sagging springs. Cheap fixes for kids on a very tight budget!
 

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