SAS Is already done. lol
I bought 78-79 Superlift 6" lift springs, and used my 89 coil buckets but I only got 6 inches of lift. I have a bronco but did the SAS and lifting on my 89 f150 supercab (in the picture <<) cause of the extra weight from the Supercab it pushed it back to 6" of lift.
Yea you have to use the 78-79 coil buckets. I think you misread it
The 78-79 coil buckets will give you the extra inch of lift, Hence putting you as 7". Again as far as cheap & leveled, what I have listed is your best option. Plus instead of having only 3, or 4, or 5 inches lift, you'll be at 7. Also, I'm not sure how those superlift coils ride, but i'd aim for skyjacker or deaver if you are going to replace the springs anyway. Both companies have spent a TON of money on R&D, and it shows in the quality of thier products.
Ok i got it.
What does it mean by bad shackle angle?
it's the angle in which the shackle is with the line from eye to eye of the leaf spring-
We'll say for shits and giggles that the front spring hanger is parallel with the frame facing towards the front. This is 0° - and the hanger parallel with the frame facing towards the rear is 180°. The higher the degree of the shackle, the stiffer the spring rate becomes, but it also allows more "Droop" - it allows the hanger to fall down more, hence your axle will articulate further. So you have to find a common meeting ground as to what you want out of it. Most people who crawl their trucks or offroad and look for decent articulation go for something in the ballpark of 135° from the frame- which is halfway facing directly rearward.
Unfortunately this is the wrong way to calculate shackle angle (from the frame) but it allows you to have a better basic understanding. It actually goes from the angle from the hanger, and the control line being from one spring eye to the other.
See these pics for better understanding of what I mean...
Here is a picture diagram explaining what I just did-
Here is a low shackle angle, decreasing articulation, but increasing ride quality (giving you a better final spring rate)
Here is a common shackle angle for offroaders (this is about 135° like I said earlier), again this will allow greater "droop" of the axle (the shackle dropping down allows the axle to articulate further) but because of the tension facing rearward, it will increase the spring rate (you'll notice it when the suspension compresses going over bumps), or in basic terms, the total overall stiffness of your set up-
Also the common meeting ground between the 2 - allowing only the flex of the springs themselves, but also not changing the spring rate & stiffness would be at 90°- here you can see that (this isn't exactly 90° but you get the point...)
Also mixed up in all of that is the degree of your pinion angle (which is big for pinion lubriction) and just as imprtant- caster angle. That's a whole nother' topic in and of itself, but I felt it important to better explain.
