I know this has been asked several times , but I did a search and culdn´t find the answer I was looking for.

Right know I´m building my front end (well not mine...the sidekick¡s front end actually , mine seams ok    )  The full samurai front end swap has given me some trouble and need to find out the spring rate for the rear samurai leaf springs. In this way I can figure out to go spoa or spua to keep tire clearance and ride height , so far the springs seams to soft.

Does anyone have any info regardig this?
thanks

With leaf springs I usually go with the "bolt it on" approach.  If they are to soft at first, add an extra spring to stiffen them up.

For height, I always try and make sure the springs have a little bit of arch to them.  To much arch and they will be to stiff and give you a really rough ride.  A lot of people run with a little bit of negative arch, which gives you more droop, without issue.

I would plan on your axle hight based off of either a neutral spring (aka straight mount to mount), or up/down one inch. 

Stock samurai springs are a short spring and relatively stiff.
If your looking for flex you might be forced into using a duel shackle to achieve it.

Sorry i didn't answer your question at all or come close to it.

Amilla

I thought about dual shackles , but i´m trying to keep it as simple as posible.
I will try to measure things up for a neutral spring condition. Do you know how a part the to bolting points for the springs are?

The Factory rates for a SJ410 are about 170lb/" for the rear and 230lb/" for the front.  The Samurai is 145lb/" for the rear and 226lb/" for the front.

To pull the spring pin you just have to un-bolt it, but thats in a perfect world.  Seems like most of the time one side starts spinning and it all seized up.  I would try heat and some vice grips if its a no good, pull out the grinder.  Then for the spring wrap you can bend them apart then separate them, or just grind it off all together.

Hope that helps

Amilla

The rear spring hangers are about 38" apart and the front hanger sits almost 6" lower than the rear hanger on the chassis. The shackle is 3" long.

In the front, the spring hangers are about 36" apart and the front hanger sits about 4.5" higher than the rear hanger and uses the same 3" shackle.

The rear springs are about 2.5" longer than the fronts.

The front springs have just over 3/4" of bow and the rears have almost 2.5" of bow although you need to keep in mind that in left hand drive vehicles the rear springs had a bit under 1&1/4" of bow on one side.

Thanks CJ , just what I needed , and everyone else for the good ideas.
It feels great when some else can tell you what you need.
As we say here " hoy por mi , mañana por ti"  (today it's for me ; tomorrow it maybe for you)
Thanks

I should have added that the distance between the spring hangers is eye to eye on a horizontal plane, that is imagine vertical lines drawn through the centers and you are measuring the horizontal distance between the two vertical lines irrespective of the fact that one eye is lower than the other.

Also, if you are going to use different length shackles then make up a mount/s that you can clamp to the chassis in different positions until you get the result you need. That is shackle angle at full droop, ride height and full compression. I made up some lightweight shackles with holes drilled at various distances to try out different combinations of shackle length and spring hanger position until I got what I was looking for.

Great idea , thanks. I'm going to take some measurements right know , maybe some pictures too for later posting.

You might want to look at doing a Shackle Reversal, with the shackle in the rear.  That way you don't have to worry about hitting your shackle on rocks when it's extended and popping your spring backwards.