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Unread 12-08-2012, 10:41 AM   #1
Ripper3494
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1994 YJ Wrangler 
 
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Location: Warrenville, Illinois
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measuring for coil springs

im going to be stretching and 4 linking the rear of my heep here pretty soon when the parts arrive and i was wondering how you guys measured for what springs to use. its going to be stretched ~7in so i already know im going to cut into the frame to mount the upper coil mount.

its either that or i bite the bullet and go with 2.5 FOA coilovers

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build thread:
[url]http://www.jeepforum.com/forum/f22/94-yj-6-0-build-spud-1218315/[/url]
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
[url]http://www.jeepforum.com/forum/f12/alternator-welder-write-up-1301614/[/url]
my tj 1/2 doors on a yj write up
[url]http://www.jeepforum.com/forum/f12/tj-uppers-yj-half-doors-hard-top-installation-1417686/[/url]
RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
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Unread 12-08-2012, 10:54 AM   #2
S8NNG8
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Unfortunately, if you're performing a "stretch mod", your measurements are going to depend on where you move the rear axle, and how you want your stance to be. You could use the front coils to get an idea by measuring them compressed, and not compressed.
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Unread 12-08-2012, 10:56 AM   #3
Ripper3494
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im actually still running leafs in the front, my question is just how to measure, like once its setup just measure coil bucket to coil bucket and somehow factor in compression to get the correct height
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build thread:
[url]http://www.jeepforum.com/forum/f22/94-yj-6-0-build-spud-1218315/[/url]
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
[url]http://www.jeepforum.com/forum/f12/alternator-welder-write-up-1301614/[/url]
my tj 1/2 doors on a yj write up
[url]http://www.jeepforum.com/forum/f12/tj-uppers-yj-half-doors-hard-top-installation-1417686/[/url]
RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
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Unread 12-08-2012, 11:27 AM   #4
S8NNG8
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I'm not the guy with your answer, but I would say its gonna depend on the spring rate, and location of the cans. Try getting ahold of a spring company that does custom applications and quiz the hell out of 'em, even if you plan to use jy springs. At least jy springs will already be broke in, so there wont be sagging down the line.
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Unread 12-08-2012, 01:52 PM   #5
jason m
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When I set up my YJ on the 14 bolt I used factory Cherokee front coils. I did like I would any other set up, put the axle at full stuff then set it up based on that.
Once I had the coil buckets tacked in set the ride or belly hieight and see how it looked. Ripper there really isnt a set way to do it, just really trial and error.

Now I added a twist to my coils, I didn't limit the down travel on them and it worked awsome. I made them so they would self center and they worked like that for 7 years and only once did not pop back in.





Maybe use the cherokee springs as the bench mark to start with, I would still be useing them but there really wasn't any room on the rearsteer 60 and I had the 2.0 anyways.

Jason.
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1993 YJ 4.0 60 Front, Rear steer 60, bolth spooled, 5.38's, 700r/241 39.5 iroks and beating it like it owes me money.

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Unread 12-08-2012, 02:24 PM   #6
Ripper3494
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Ive seen your design in your other posts and for a rock crawler that's really cool but being my rig still gets DD duty when I'm in a good mood im not sure how that would fare on the road.

As for spring length you said you set it up at full bump, what exactly do you mean by that? Did you weld the buckets on at full bump do that they would be parallel or what? Ive never dealt much with coils so I'm kind of at a loss. Maybe some of this info will carry over to when i weld all the brackets on an 8.8 for a tj
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build thread:
[url]http://www.jeepforum.com/forum/f22/94-yj-6-0-build-spud-1218315/[/url]
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
[url]http://www.jeepforum.com/forum/f12/alternator-welder-write-up-1301614/[/url]
my tj 1/2 doors on a yj write up
[url]http://www.jeepforum.com/forum/f12/tj-uppers-yj-half-doors-hard-top-installation-1417686/[/url]
RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
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Unread 12-08-2012, 02:29 PM   #7
Ripper3494
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Also just a question. Around here you hear the term useless flex alot referring to when there is no spring pressure pushing the wheel to the ground. Now your setup obviously works, so was the weight from the axle, wheel, and downforce from the shock enough to keep a good grip?
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build thread:
[url]http://www.jeepforum.com/forum/f22/94-yj-6-0-build-spud-1218315/[/url]
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
[url]http://www.jeepforum.com/forum/f12/alternator-welder-write-up-1301614/[/url]
my tj 1/2 doors on a yj write up
[url]http://www.jeepforum.com/forum/f12/tj-uppers-yj-half-doors-hard-top-installation-1417686/[/url]
RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
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Unread 12-08-2012, 06:22 PM   #8
jason m
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I allways build under full stuff this way I know everything will clear. With coils its tuff to get an idea as to how much they will compress as its damm near impossable to compress them.
Air shocks its a no brainer to build under full stuff. Just make sure there empty of gas and oil and build off the bottom eye and were the top lands build tabs for that area.
Coils there alot harder but not impossable to figure out. Just need to kinda guess the compressed coil hieght and build from there.

Now is the "right" way I cant say, it worked for me.

Jason.
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1993 YJ 4.0 60 Front, Rear steer 60, bolth spooled, 5.38's, 700r/241 39.5 iroks and beating it like it owes me money.

And on the 8th day, God created the 14 bolt....
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Unread 12-08-2012, 06:26 PM   #9
jason m
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Quote:
Originally Posted by Ripper3494 View Post
Also just a question. Around here you hear the term useless flex alot referring to when there is no spring pressure pushing the wheel to the ground. Now your setup obviously works, so was the weight from the axle, wheel, and downforce from the shock enough to keep a good grip?
Yes it worked very well and I understand the term useless flex. To me thats like the revolver shackles they work in theory but create alot of axle wrap. Not really sure how to explain how or why it worked so well but it did, I see it in my mind but right now can't explain it.

But yes again it worked and worked very well. very stable and tons of traction.

Jason.
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1993 YJ 4.0 60 Front, Rear steer 60, bolth spooled, 5.38's, 700r/241 39.5 iroks and beating it like it owes me money.

And on the 8th day, God created the 14 bolt....
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Unread 12-08-2012, 06:49 PM   #10
Ripper3494
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Quote:
Originally Posted by jason m View Post
I allways build under full stuff this way I know everything will clear. With coils its tuff to get an idea as to how much they will compress as its damm near impossable to compress them.
Air shocks its a no brainer to build under full stuff. Just make sure there empty of gas and oil and build off the bottom eye and were the top lands build tabs for that area.
Coils there alot harder but not impossable to figure out. Just need to kinda guess the compressed coil hieght and build from there.

Now is the "right" way I cant say, it worked for me.

Jason.
That makes sense. I may just get a random set of coils and just build my front to match as long as its close. Leaf springs are easier to play with
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build thread:
[url]http://www.jeepforum.com/forum/f22/94-yj-6-0-build-spud-1218315/[/url]
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
[url]http://www.jeepforum.com/forum/f12/alternator-welder-write-up-1301614/[/url]
my tj 1/2 doors on a yj write up
[url]http://www.jeepforum.com/forum/f12/tj-uppers-yj-half-doors-hard-top-installation-1417686/[/url]
RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
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Unread 12-08-2012, 06:52 PM   #11
Ripper3494
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How stiff are the cherokee springs? id imagine pretty stiff due to the engine being on top of them. But your rig i can imagine is pretty light in the back
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build thread:
[url]http://www.jeepforum.com/forum/f22/94-yj-6-0-build-spud-1218315/[/url]
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
[url]http://www.jeepforum.com/forum/f12/alternator-welder-write-up-1301614/[/url]
my tj 1/2 doors on a yj write up
[url]http://www.jeepforum.com/forum/f12/tj-uppers-yj-half-doors-hard-top-installation-1417686/[/url]
RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
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Unread 12-08-2012, 09:01 PM   #12
jason m
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Quote:
Originally Posted by Ripper3494 View Post
How stiff are the cherokee springs? id imagine pretty stiff due to the engine being on top of them. But your rig i can imagine is pretty light in the back
Good question, I want to say my is light but really its not. I carry enough tools and extra fluid, plus a 8 gallon ( or so ) fuel cell, high lift and some time trails spares. So she is a little fat in the trunk.

The stock coils worked perfect for me, plenty of flex and I can compress them without any problems, agin for me. You they might not work as good, but there normally found free and if they dont work get maybe stiffer one's.

Jason.
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1993 YJ 4.0 60 Front, Rear steer 60, bolth spooled, 5.38's, 700r/241 39.5 iroks and beating it like it owes me money.

And on the 8th day, God created the 14 bolt....
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Unread 12-15-2012, 04:03 PM   #13
ltrail
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For my xj I started with stock front spring. Ended up using rear tj stock spring and movie uppers to get the height I wanted. The plus side to fronts is you could cut a loop and lower a little. Tj rears are beehive style so that won't work. Now I went lower and used a Volvo 240 rear spring. Nice and soft, about same diameter as xj front and I used the top cup from Volvo also. They can be had under most 84-94 Volvo 240's.

If you have ever driven the said Volvo they like foreign caddy, rides like a boat in water.
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Unread 12-15-2012, 07:58 PM   #14
Ripper3494
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ive decided to rebuild the rear of my frame with standard square tubing so i can just make it whatever height will fit the springs i get, preferably longer springs since i have some really nice down travel.
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build thread:
[url]http://www.jeepforum.com/forum/f22/94-yj-6-0-build-spud-1218315/[/url]
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
[url]http://www.jeepforum.com/forum/f12/alternator-welder-write-up-1301614/[/url]
my tj 1/2 doors on a yj write up
[url]http://www.jeepforum.com/forum/f12/tj-uppers-yj-half-doors-hard-top-installation-1417686/[/url]
RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
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