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Unread 03-23-2013, 12:30 AM   #1
ceej7
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1985 CJ7 
 
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Spring height help

how much lift will i gain ( if any ) from a stock wrangler spring swap on my stock spring (sprung ?) 85 cj7 renegade? I see stock wrangler springs on craigslist quite often for 50 - 100 per set and thought i could convert now for little $$$ and upgrade just the springs later. hoping for a little lift out of stock wranglers till then.

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Unread 03-23-2013, 01:42 AM   #2
BagusJeep
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Depends on what you have and what you buy.

Your CJ is a 258 with big bumpers but no hardtop or steel doors or winch. My guess is 3300lbs?
A YJ is what? 2800 to 3200 lbs?

My guess is that you will put more weight on the YJ springs than they were intended for and if they were light duty and yours were originally heavy duty it would sink. Moving to heavy duty springs would be a pain as they will flex less. You may end up slightly higher if your springs are very worn but it is not the intent of the swap.

The swap is aimed to give you wider and longer springs which allows more flex and comfort as the springs can be ....... springier.
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Unread 03-23-2013, 02:54 PM   #3
ceej7
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my cj is probably heavier as i have custom 4" pipe bumpers front and rear, hardtop / doors and custom rocker guards / sidesteps with 6 cyl engine. the stock springs are completely flat, even without top. just looking for a better ride/flex than i have without initial cost of the full blown yj lift conversion. i will eventually upgrade to OME (probably) 2 1/2 lift set up, but for now just want to upgrade my dd , and will probably go with crabtree hangers on used yj springs, then sell the used springs back on craigslist when time for upgrade. the jeep came with soft top originally so are the springs light duty?
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Unread 03-23-2013, 06:54 PM   #4
skizriz
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Here is a picture of my steering setup with my stock CJ springs. Notice the drag link and tie rod are perfectly parallel with each other.


Here is a picture of it with the YJ springs. The drag link and tie rod are still perfectly parallel with each other. Very little lift if any.


I though I was going to get a slight lift, but the YJ springs settled out as flat as the CJ springs. The rear did rise about 2", but that is because my rear springs were trashed.
My Jeep is also very light. Fiberglass everything, lightweight bumpers, stripped of anything not needed.

You can figure out spring rates by measuring the thickness of the spring pack. Here's the specs.
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78 CJ7 258 TH400/Dana18 SOA/stock YJ springs 35" General Grabbers.
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Unread 03-23-2013, 08:41 PM   #5
firemanjim7
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That also shows the Cj and wrangler both have 44" packs. If that's right why do you have to move the front shackle mount forward 1 1/8"?

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Unread 03-23-2013, 08:42 PM   #6
firemanjim7
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Nevermind that last post. I saw the A&B measurements now.

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Unread 03-23-2013, 08:46 PM   #7
skizriz
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Quote:
Originally Posted by firemanjim7
That also shows the Cj and wrangler both have 44" packs. If that's right why do you have to move the front shackle mount forward 1 1/8"?

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Look at the A-B measurement. CJ's are 22 1/16. YJs are 22 11/16.
You would double that measurement.

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78 CJ7 258 TH400/Dana18 SOA/stock YJ springs 35" General Grabbers.
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