Shacle Reversal

[Dmntxn77]

Yeah, I can picture it working either way I guess.. It seems that with the shackle forward, you would be at risk of getting it pinned forward when recovering from a droop condition...

Dunno really... Ive never done one, but in my head, it seems that facing back would be the better option...

[guishe]

I think that the arch in the springs counts... in the images I have with flat springs, the shacles is at 0°, or "negative" (as in the pictures from fulsizejeep, which are just as you mention).
With lift springs (4" or more) I´ve seen as in my draw. But I dont know if they could go flat forward as you said. Perhaps a more conservative angle would work better. With so many opinions in this issue, seems difficult to find a definitive word about this question.

[fulsizjeep]

better view of shackle and pinion angle

[j20brett]

Wow not much compression travel there eh? ever have probles with it bottoming out?

[Dmntxn77]

Yep Flint, that accounts for the scary handling... Your caster and camber are probably WAY off.

[j20brett]

Yep Flint, that accounts for the scary handling... Your caster and camber are probably WAY off.

Nah looks to me like the c's were cut and rotated to correct that. i think its the lack of steering correction that make his handling bad. No DPA or highsteer to correct it.

[C. Boyer]

From the looks of it. It looks like they simply took the stock shackle off the front, bolted the spring to the stock hanger, and then stuck the shackle on the rear hanger.

That's what I did and the smoothness is insane. Remove the front driveshaft and have it fabricated so it doesnen't bottom out. I did that too. You have to measure the compression and droop, NOT JUST YOKE TO YOKE. The 78 has 12-14 inches of wheel travel so you may have to cut the rear of the front fender a little bit. It drives strait as an arrow, on and of road. Through whoops it's in an insane difference!

Whatever you're into

[4x4fEvEr]

I'm getting a kit for a yj to put on mine hopefully be able to start it in two weeks. I read in petersens this month on a shackle flip to set the rear shackle at 60degrees with no weight on if course

[fulsizjeep]

Well, thanks to this exercise, I realized that drive shaft is too long. I did not notice until I resized the picture. We have not put this one through too much difficult terrain but had never heard or felt it bottom out. Something else to change when the QT & adapter get changed out this spring. We have some rocks here I can exercise it on and see how much travel there is to the rear. The drive shaft was new in 2003. The C were rotated but I don't know how much.

[guishe]

I read in petersens this month on a shackle flip to set the rear shackle at 60degrees with no weight on if course

It seems that this answers the question of the 30 degrees forward/backwards? ... the shackle is set in the position I mention without weight, whit springs extended; and then with the weight as the springs get a bit compressed. the shackle goes backwards, as you said...

[rustywagoneers_com]

That's what I did and the smoothness is insane. Remove the front driveshaft and have it fabricated so it doesnen't bottom out. I did that too. You have to measure the compression and droop, NOT JUST YOKE TO YOKE. The 78 has 12-14 inches of wheel travel so you may have to cut the rear of the front fender a little bit. It drives strait as an arrow, on and of road. Through whoops it's in an insane difference!

Whatever you're into

Pics?

[Dmntxn77]

Well, thanks to this exercise, I realized that drive shaft is too long. I did not notice until I resized the picture. We have not put this one through too much difficult terrain but had never heard or felt it bottom out. Something else to change when the QT & adapter get changed out this spring. We have some rocks here I can exercise it on and see how much travel there is to the rear. The drive shaft was new in 2003. The C were rotated but I don't know how much.

Yep, now that its pointed out, I see that your knuckles seem to have proper orientation.

I would guess that your pinon has been rotated up 10-15 degrees. If I could access photobucket at work, I would post a pic for you of mine that has been rotated up 12 degrees...

Eitherway, that leaves you with quite the desirable axle there!!

[AlsChopShop]

It seems that this answers the question of the 30 degrees forward/backwards? ... the shackle is set in the position I mention without weight, whit springs extended; and then with the weight as the springs get a bit compressed. the shackle goes backwards, as you said...

yes... that's what they are doing in the first article that was posted. with no weight the shackle is forward, but with weight it will move back.

look how the toyota guys do it... shackle backwards. if your shackle is forwards it puts a lot more force on the shackle and its mounting point as the spring extends in length. its working against itself.

Al

[4x4fEvEr]

So in a fsj do you want them forward or backwards using springs with some arch?

[guishe]

So in a fsj do you want them forward or backwards using springs with some arch?

Install them looking fordward while the rig is lifted (no weight).
They will go backwards when you drop the weight on the floor, but they should still have more "travel" backwards to let the springs extend when under compresion