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  #1  
Old 04-29-2008, 02:07 PM
The PIG Smith's Avatar
The PIG Smith The PIG Smith is offline
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Join Date: Nov 30, 2001
Location: Fort Wayne, Indiana
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More Front Spring Rate Questions

Background
I wrecked my newly acquired J10 and then recently while putting it back together, it was discovered the top leaf of the passenger side front spring is broke.

I sorta started asking about this in another post.
HARDCORE pacer provided some good comments (Thank You!)

Quote:
Originally Posted by HARDCORE pacer
I had springs made for my rig and was told by the spring manufacturer that all the fsjs had the same front springs except early waggies. When I got home I went looking through all the wrecks here and they all had the same 4 leaf pack in the front and that is j-20s j-10s waggies and cheros. I think you could use the main leaf out of a waggie pack and not know the difference when you are done and not have to do anything regarding lifts and the such.

Quote:
Originally Posted by The PIG Smith
I've been told several different things and I dunno what to think.
Yes, they all have 4 leafs, but have been told some springs are rated different than others.
Like a SWB, I6 powered J10 will have lighter springs rates than a LWB, V8 powered J10.
Looking at the GVWR for J10s and Wagoneers in our Tech Library, the ratings are very close.
I know my #7600 rated J20 rear springs do not hardly ever flex...and I've towed some monster loads.
I would hate to think about the #8400 springs!
But, are the front J20 springs different than J10/Wagoneer? I dunno.

I recently purchased from a fellow member a set of front springs from a J10 that was a long wheel base and powered by an I6.
This donor is a late 70s J10, while my J10 is an '82 model.

I've been talking to several folks...all of whom give me a different answer.
My basic questions still remain to be answered or confirmed.

1. While the GVWR of J10 models vary, are all the front springs the same spring rate?
2. Is the difference in GVWR is made up with rear springs of different rates?
3. Is there any difference in Wagoneer front springs rates and J10?

Long term, I am thinking of maybe dropping my 6.2L Diesel into my J10, making it a semi Daily Driver.
I am wanting to not have any issues with a 6.2L overworking light duty J10 front springs.
Also, I may want to do some towing, especially if a drop in a Diesel, and do not want light duty front suspension bobbing up and down under the stress of a heavy trailer.

Thank you for your patience while I wrap my weak mind about these concepts.
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2005 Grand Cherokee Limited - HEMI! Current Daily Driver
1982 J10: Stalled Project.
1981 J20: Commercial flat bed. Lost in Divorce
1987 J20 Pioneer: Former 'Ricbee' plow rig. RUST!!

Quote:
Originally Posted by Jayrodoh
...but if it works, I wouldn't touch it.
Quote:
Originally Posted by Lindel
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  #2  
Old 04-29-2008, 03:37 PM
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Billygoat Billygoat is offline
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Join Date: Mar 16, 2004
Location: Southwest Wisconsin
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Spring steel is very consistant, the thickness, width and lenght determine rate, and total spring count for the pack - discount age sag of course.

If the leaf is the same thikness+width+length as yours it is the same rate, top leaves are a little more picky becuase of bushings... But any spring with the same messurements will act the same, weather it is from a waggy, chero, ford, chevy, dodge.........

You should messure thickness with a calipers, not a tape messure.
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  #3  
Old 04-29-2008, 05:06 PM
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Kali Kali is offline
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Join Date: Mar 29, 2005
Location: New Hampshire
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Quote:
1. While the GVWR of J10 models vary, are all the front springs the same spring rate?
2. Is the difference in GVWR is made up with rear springs of different rates?
3. Is there any difference in Wagoneer front springs rates and J10?

1. GVWR is the same for the SWB and LWB J-10 in 1982, which is 6200lbs. In 82 both LWB and SWB J-10s had 5 leaf 215 lb front spring packs standard. I thought there was also an option for a heavy duty J-10 suspension but Im not seeing it. Variations in the GVWR across the years (I think) is only because the weight of the vehicle itself changed.

2. Again, GVWR is the same for the SWB and LWB J-10. My 82 stuff says SWB J-10s had 5 leaf 165 lb rear packs and LWB J-10s had 4 leaf 245 lb rear packs.

3. There was an option for soft riding suspension for wagos but it doesnt list spring ratings. 82 literature says the Wagos had a 6 leaf 210 lb front pack (J-10s had a 5 leaf 215 lb front spring pack).

Hope this helps, perhaps someone with the year J-10 your donor springs are from will have some factory specs to post up.
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  #4  
Old 05-01-2008, 10:24 AM
The PIG Smith's Avatar
The PIG Smith The PIG Smith is offline
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Thank you!
This is the info I was seeking.
I will rest easier tonight.

For those of you that grit your teeth and slap your forehead when you see me being stupid, thank you for your patience as I sort all these facts out.
__________________
Bryan Smith
2005 Grand Cherokee Limited - HEMI! Current Daily Driver
1982 J10: Stalled Project.
1981 J20: Commercial flat bed. Lost in Divorce
1987 J20 Pioneer: Former 'Ricbee' plow rig. RUST!!

Quote:
Originally Posted by Jayrodoh
...but if it works, I wouldn't touch it.
Quote:
Originally Posted by Lindel
Best laid plans, yada yada yada...
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  #5  
Old 05-01-2008, 11:01 AM
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skeletor skeletor is offline
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Join Date: Jan 31, 2006
Location: richmond, va
Posts: 1,360
when i got my cherokee it had a 2 leaf pack front but the leaves where like an inch thick. i never knew if that was stock, but it was a navy jeep in its past life.
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  #6  
Old 05-01-2008, 12:15 PM
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j20brett j20brett is offline
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Location: Katy, Texas
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7 leaf front packs in my 81 j20
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