Can I install rear YJ leaf springs in the front of my YJ? - JeepForum.com
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Unread 10-06-2009, 06:08 AM   #1
Jeepwood
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1993 YJ Wrangler 
 
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Can I install rear YJ leaf springs in the front of my YJ?

I'm installing a 2" Add-a-leaf kit on my 94 YJ tomorrow.

I noticed that the rear springs have 5 leafs and the front have only 4 and sit about one inch lower to the ground(due to the weight of the engine, i'm sure).

I have 2 extra pairs of rear (5 leaf) sitting around my house.

So my question is: Can I use my extra 5 leaf springs i have laying around on the front of the jeep, to raise it that extra inch?

Also when i add the AAL 2" spring, can i also add another spring from another pack to give it an additional lift?

Please advise...

PS: I don't care about ride quality or how stiff this may or may not make the ride, this is my winter beater / off road toy?

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Unread 10-06-2009, 07:25 AM   #2
fishwater2
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When I picked my YJ up the PO had the rears installed in the front, they are the same length & will work without a doubt.
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Unread 10-06-2009, 08:42 AM   #3
cmsurfer
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Yep... When I got my BDS lift, I bought 4 rear spring packs.
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Unread 10-06-2009, 08:47 AM   #4
muddy93
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[QUOTE=Jeepwood;8053523]

Also when i add the AAL 2" spring, can i also add another spring from another pack to give it an additional lift?

Please advise... QUOTE]


I'm guessing that you are still spring under? if so, simply adding another spring(unless it has more arch, and a higher spring rate, than your AAL) is going to lower the jeep. granted, it will only lower it the thickness of the spring, but it's still going to lower it.
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Unread 10-06-2009, 09:09 AM   #5
YJake
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Quote:
Originally Posted by cmsurfer View Post
Yep... When I got my BDS lift, I bought 4 rear spring packs.
What would be the advantage of this?

I plan to go BDS or OME when I lift.
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Unread 10-06-2009, 12:00 PM   #6
Jeepwood
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Quote:
Originally Posted by muddy93 View Post
I'm guessing that you are still spring under? if so, simply adding another spring(unless it has more arch, and a higher spring rate, than your AAL) is going to lower the jeep. granted, it will only lower it the thickness of the spring, but it's still going to lower it.
Yes i am still spring under.

Do you mean lift it?
If you diid mean it will lower it, that why?
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Unread 10-06-2009, 12:13 PM   #7
muddy93
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Quote:
Originally Posted by Jeepwood View Post
Yes i am still spring under.

Do you mean lift it?
no, I meant "lower" it.
If you diid mean it will lower it, that why?

technically, it would depend on where in the leaf pack that you placed the extra spring. if the extra spring is placed between the main leaf and axle, it will raise the axle in relation to the frame, which will lower the jeep. if the extra spring is placed below the main leaf, it will NOT lower the jeep, but it also will NOT lift it either(with the exception of AAL's which have more arch and spring rate, which basically forces the rest of the springs to have more arch.).
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Unread 10-06-2009, 12:18 PM   #8
muddy93
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ok, this pic should explain it a little better than I can.
basically, with a Spring Under Axle suspension, anything placed between the main leaf and the axle, will lower the vehicle.
anything placed under the main leaf(with the exception of AAL's or other springs that have either more arch, or a higher spring rate), will have no effect on vehicle height.
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Unread 10-06-2009, 01:03 PM   #9
cmsurfer
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Quote:
Originally Posted by MosinMe View Post
What would be the advantage of this?

I plan to go BDS or OME when I lift.
Now that I think of it, I think I have 4 front leaf packs. I believe the extra leaf in the front packs is to help with all the weight from the engine. Running a hardtop and rear tire carrier was sagging my old springs.
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Unread 10-06-2009, 01:32 PM   #10
giggityjeeper
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Quote:
Originally Posted by MosinMe View Post
What would be the advantage of this?

I plan to go BDS or OME when I lift.
one advantage is OME DOES NOT MAKE A HD front spring only a rear, so I bought 4 rear HD springs, or VS versa, they odnt make a HD for front or back so you have to get 2 pairs of the same I cant remember now......but OME you WANT HD, and the BEST spring EVER....WOW FLEX

and like the other guys said adding a leaf to spring under will lower your ride......
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Unread 10-06-2009, 01:37 PM   #11
93jeepyj
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Quote:
Originally Posted by cmsurfer View Post
Now that I think of it, I think I have 4 front leaf packs. I believe the extra leaf in the front packs is to help with all the weight from the engine. Running a hardtop and rear tire carrier was sagging my old springs.
That sounds more like it. I had the same thing happen with my springs and I talked to bds about it and they sent me HD springs for the rear which were the same as the springs I already had up front. All of my springs have 5 leaves in them now and it sits level with the hardtop on and and inch higher in back with the soft top on.
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Unread 10-06-2009, 07:52 PM   #12
Jeepwood
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Quote:
Originally Posted by muddy93 View Post
ok, this pic should explain it a little better than I can.
basically, with a Spring Under Axle suspension, anything placed between the main leaf and the axle, will lower the vehicle.
anything placed under the main leaf(with the exception of AAL's or other springs that have either more arch, or a higher spring rate), will have no effect on vehicle height.
I understand that by adding a block under the axle but over the leaf will lower it, that makes sense.

But for example, if i added my AAL spring plus another stock large spring, for 7 springs in total, the additional stock spring will not have any effect on raising the vehicle, because the spring rate is not any grater than the other factory springs?

So stacking up additional factory springs will not raise the Jeep, only if they had more arch, or a higher spring rate, right?
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Unread 10-06-2009, 07:58 PM   #13
93jeepyj
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Right but it would ride stiffer and probably have more load capacity with the extra leaves. Some guys will add a main leaf with the eyes cut off from a dakota or maybe an s10 because they have more arch. Im not sure that that would do much for you since you already have the AAL though.
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Unread 02-06-2016, 04:55 PM   #14
skipstein
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Howdy;
I own a 1991 Wrangler 2.5L 4 banger, that started life with a soft top and now runs a hardtop permanently. I have the stock 'normal duty' suspension. I will be adding a Warn M8000 winch to the front of the Wrangler this spring. I figure that adding 'heavy duty' springs all around will do the trick. I would also like to run 'rear' 6 leaf Crown HD springs on all four corners. As I read the thread, this is OK as the front and rear are the same, eh? I also will be adding new Bilstein shocks and Crown HD shackle kit. Any comments?
Thanks,
Skip
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Unread 02-06-2016, 07:23 PM   #15
csmit328
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All 4 leafs should be the same. Im not sure if some manufacturers are different but I had some Rubicon Express springs that all had the same part number and ended up getting put on a friends jeep (long story). The Jeep was as level as any other and he said he had no problems putting them on. You should be good but there are others with more experience that can tell you if I am right or not.
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