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-   -   Shacle Reversal (http://www.ifsja.org/forums/vb/showthread.php?t=95407)

4x4fEvEr 12-30-2008 09:40 AM

Shacle Reversal
 
This desrves its own thread.

Who's got one?

My reason for wanting one is to help keep my front springs from bending. As you know a reversal pushes the axle back as u hit an obstacle and standard shackles push forward which with he tires pushin too equals a lot of stress on the rear of the springs. So good idea to do it right?
I'm ruunin stock springs with AAL right now does that net the same lift as shackles forward?
I need some input

4x4fEvEr 12-30-2008 10:07 AM

Ok trasborgs article says it keeps the leaves from bending but for rockcrawling leave em forward, but Cappa did it to hotdog hmmmm

j20brett 12-30-2008 10:29 AM

The only reason to leave them forward is that it forces the leaves into the obstacle, instead of away, making it easier to climb. But the advantage of not bending leaves anymore far outweighs a small climbing advantage.

4x4fEvEr 12-30-2008 11:12 AM

This is true. I'm finding all kinds of articles for them but none apply to fsj's

fulsizjeep 12-30-2008 11:25 AM

Our 76 Waggy with SOA has the front shackles reversed and it flexes like an Olympic gymnast. :thumbsup: It was set up this way when we got it so I am not sure what all was done in the reversal process.

Long&Low 12-30-2008 11:29 AM

I ran a shackle reversal on my YJ. It allows the spring and axle to climb stepped obstacles better.

But there is a down side or two. First the axle will have move fore and axle movement, so you may end up needing a longer splined area for your front driveshaft. Mine needed a 12" slip joint. That gets kind of spendy, unless you want to run a squate tubed front driveshaft. With that extra for and aft movement, you may run into the tire coming up and into the rear of the fender during the lift cycle. And as it cycles down, the axle will move farther forward.

As for street driving, under hard braking, your nost will dive down.

All in all it's six of one, half dozen of the other. A lot goes into how you set up the spring. Do you make your front mount higher or leave it level (level as in parallel to the ground)? You can dial in how the spring will react on obstacles if you place it differently.

It really doesn't matter if it's a baby Jeep or FSJ, the charateristics will be the same.

j20brett 12-30-2008 11:31 AM

Quote:

Originally Posted by fulsizjeep
Our 76 Waggy with SOA has the front shackles reversed and it flexes like an Olympic gymnast. :thumbsup: It was set up this way when we got it so I am not sure what all was done in the reversal process.


Could you possibly take a few pics of the front and rear hangers? Thanks!

fulsizjeep 12-30-2008 11:35 AM

Sure, when I feel like laying in the snow again. ;)
The spring hangers are stock. The only thing that changed on the springs was the shackle move to the rear.
The front shaft is longer than stock and has longer yoke section to help with axle moving back when compressed.

4x4fEvEr 12-30-2008 12:25 PM

The only thing I care about is bending springs and trasborg says in steep climbs the front end wanders. I dontlike that.

I'm ruunin a square shaft already and I don't care about bodydamage there's not a straight dent free panel on mine and I don't run on the road so all those concerns are out the window.

I'd like to see pics as well seen a rough country kit for $110 bucks I may get that and have at it

fulsizjeep 12-30-2008 12:28 PM

Quote:

Originally Posted by 4x4fEvEr
The only thing I care about is bending springs and trasborg says in steep climbs the front end wanders.

It wanders more on the pavement than anywhere else. We got used to it. It is fun to get someone riding shot gun in it for the first time. ;)

jtr 12-30-2008 04:59 PM

I am going to save my $$ and 3 link front and some kind of link setup in the rear. Early Bronco springs would work good in the front I think.


Leafs just arn't going to last long for your application, IMO.

Elliott 12-30-2008 05:29 PM

These guys (members here) have a SR kit for FSJs: http://www.tandjperformance.com/main.shtml

4x4fEvEr 12-30-2008 06:21 PM

Quote:

Originally Posted by jtr

Leafs just arn't going to last long for your application, IMO.


Yea tru links and coils would be great. Not even in the budget though

Long&Low 12-31-2008 11:25 AM

Quote:

Originally Posted by 4x4fEvEr
The only thing I care about is bending springs and trasborg says in steep climbs the front end wanders. I dontlike that.

I'm ruunin a square shaft already and I don't care about bodydamage there's not a straight dent free panel on mine and I don't run on the road so all those concerns are out the window.

I'd like to see pics as well seen a rough country kit for $110 bucks I may get that and have at it


Tell Pete you'll get less wandering with an SRS system than without, hillclimbing or not.

Stuka 12-31-2008 12:21 PM

It should also be noted that your front drive shaft will be forced to operate at a much higher angle when the axle droops. As the pinion will point down instead of up (as it does with a front shackle). So you look fine for slippage with the square shaft, but the u-joints are going to need more angle (unless you already have 1410's or the like).

And, if you drive on the street, you will get a lot of nose dive when you brake hard as when the axle pushed back, the shackle will give, which allows the axle to move up as well.

Dmntxn77 12-31-2008 12:26 PM

When flexing now, your pinion gets pointed towards your transfercase. When flexing with a shackle reversal, your pinion gets pointed towards the ground.

You will need to make sure that your drivelines can handle the extra angle.

You can rotate the leaf perches around the axle a little bit, but that is a lot of work for anyone who is already spring over. Plus, I wouldnt reccomend cheating it more than 2 degrees anyway otherwise it will wander like a yaht at higher speeds.

Dmntxn77 12-31-2008 12:27 PM

I guess I type too slow... Stuka beat me to it...

Dmntxn77 12-31-2008 12:30 PM

Anther point to cover is axle movement withing the wheelwell. Stock, the tire sits closer to the firewall than it does the bumper since it will move forward during flex. Once you switch the shackle, your axle will move the opposite direction. So, you will probably need to reposition your axle closer to the bumper so that when you flex, it does not get forced into the firewall.

4x4fEvEr 12-31-2008 12:54 PM

Good points! I have a 1410 yoke for the front but no driveshaft yoke I gotta find one, and I could turn mine up 2 degrees no problem plus I'm already highpinion so I think ill be safe. I've got the front axle pushed forward two inches as is it was eating into my turn signals which are gone now so I should be fine if not I can always make room. I'm def going to do the shackle reversal

Dmntxn77 12-31-2008 03:41 PM

Cool, go for it...


If I were you though, I would measure your pinion angle at full flex just be be sure. Remember, the HP D60 pinion location is only 2.25"s higher than the LP D60, so its not THAT big of a difference. It still doesnt point your pinion up.


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