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Old 04-10-2015, 03:02 PM   #1
Sklptrljay
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Leaf spring rear end swap confusion

I read a bunch of posts about swapping rear ends, but with all the variables I'm not clear on the answer for my application.

Will a leaf spring 12 bolt rear end from a 73 K/10 (1/2 ton) Blazer fit in a 67-72 leaf spring C/20 (3/4)?

Fit without modifications is what I'm really asking.
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Old 04-10-2015, 09:52 PM   #2
Mike C
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Re: Leaf spring rear end swap confusion

I think so. Should be the same 42.5" spring centers, but at least one of the shock mounts has to be redone either on the housing or the frame. Use your original parking brake cables.

But there will be some small modifications needed. Possibly conversion u-joint and/or longer driveshaft. Find a C10 rear from a 69-72 if you want a true bolt in.
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Old 04-10-2015, 11:18 PM   #3
Sklptrljay
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Re: Leaf spring rear end swap confusion

Quote:
Originally Posted by Mike C View Post
I think so. Should be the same 42.5" spring centers, but at least one of the shock mounts has to be redone either on the housing or the frame. Use your original parking brake cables.

But there will be some small modifications needed. Possibly conversion u-joint and/or longer driveshaft. Find a C10 rear from a 69-72 if you want a true bolt in.
Thanks Mike, this is going to be used in a truck bed trailer application. So all I need to worry about is mounting it and shocks.
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1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list.

1972 GMC 4X4 K1500 Survivor - Sold

No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy
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Old 04-10-2015, 11:23 PM   #4
Coley
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Re: Leaf spring rear end swap confusion

The other major issue, if it applies...is the 3/4 ton would have 8 bolt. 16" rims and the 73 1/2 ton diff. would definitely be a 6 bolt and might be a 15" rim....if any of this plays into your plans.
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Old 04-10-2015, 11:58 PM   #5
Sklptrljay
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Re: Leaf spring rear end swap confusion

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Originally Posted by Coley View Post
The other major issue, if it applies...is the 3/4 ton would have 8 bolt. 16" rims and the 73 1/2 ton diff. would definitely be a 6 bolt and might be a 15" rim....if any of this plays into your plans.
All Good
Coley
That is it exactly. I'd like to have rally rims eventually so the trailer matches my truck.
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1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list.

1972 GMC 4X4 K1500 Survivor - Sold

No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy
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Old 04-11-2015, 11:11 AM   #6
Mike C
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Re: Leaf spring rear end swap confusion

And the spring perches will be for 2 1/2" springs instead of 2 1/4", but that shouldn't have any real affect on the whole project. I've got a bed that I've always planned on building a camper trailer out of so look forward to future updates on your project.
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68 Camaro 'vert LT1 & TH700
69 Z/28 355 12.6's @110
69 Chevy Short Step 4 1/2"/7" drop
72 Jimmy 4WD 4spd 4" & 35's
02 GMC 2500HD 4x4 Duramax
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