Ok I have been trying to fine tune my suspension for some time now. I have Allpro's 3" lift with crossover and all the other crap. When I first instaled the lift I did a shitty job mounting the rear shackels they were close to vertical. So I bought the jonny joint shackel hanger and re-did them, I now have an 8" shackel at a perfect 45 degree angle. My problem is when i flex the truck the shackel will never drop down more than 10 or 20 degrees. I have seen other trucks where the shackel will drop down to vertical but mine wont come close. I cant think of what would be limiting it when I tested it I took the shocks off and had the same shity result, Whats the deal am I over lookin something?
Thanks For Any Help
Nick

It sounds like your spring is limiting it.

Do you have spring clamps around your leafs?

Yes but they are bent up in the rear not the front through. But still the spring should be able to swing down with out it limiting itself anyways Right? :confused:

How much of an angle that the shackle swings depends on the length fo the shackle in relation to the change in eye-eye length of the springs between full droop and flat.So it could simply be that your shackle length is a bit on the long side for those springs. For a give set of springs and shackle hanger position, a shorter shackle will swing a wider angle than a longer one will. If the front to rear hanger distance is less than the spring's relaxed eye-eye length, then you won't get a vertical shackle angle. I have a link to some info on calculating all the angles and lengths if you want to plug in your data:
http://www.4crawler.com/4x4/CheapTricks/Ramp.shtml#Applications

I now have an 8" shackel at a perfect 45 degree angle. My problem is when i flex the truck the shackel will never drop down more than 10 or 20 degrees. I have seen other trucks where the shackel will drop down to vertical but mine wont come close. This is on the front end; the recommended length for the front shackle is 1.5-2 inches over stock. Why do you have such a long shackle? What does your pinion angle look like? If it is, still stock pinion angle the u-joint could be binding and holding the flex. When I first did mine, I had 5.5-inch shackles and my d-shaft was binding. Did you mount the JJ through the frame or under the frame? :grinpimp:

didn't see anyone mention what kind of shocks/how they're mounted? They could be limiting your travel too...

The shackle eye bolts could also be cranked too tight...I gained a couple of inches by getting my tire in the air, then loosening the shackle bolt until it dropped as much as is *physically* possible.

8" is a LONG shackle for a relatively short spring, so its not going to swing as far. You didn't mention if you had the longer than stock springs or not (56" vs. ~48"?), but it sounds like you don't, so its going to be worse.

Stock length is about 3", most SAS'ers run around 4.5-6" as OOP's mentioned. FWIW, I run a 6" shackle with 63" springs.

If it works, don't worry about the "swing." If it doesn't for some reason, then fix it.

This is in the rear not the front, and the test was done with the shocks dislocated. So the diferance between a compressed spring and a droped spring is how the shackel will move? :confused: That doesnt seem right with my set up, cause the differance is only about 1.5 to 2"s? This sucks I just want the rear to flex as good as the front.
Thanks

Simple geometry, if your springs are only changing length by 2", then an 8" shackle will change about 20 degrees in angle:

http://www.saltire.com/applets/triangles/tri3s.htm

Springs may not have the same free arch that the ones you have seen the work better do.

This sucks I just want the rear to flex as good as the front.


Don't forget that you've got the wider perch width working against you in the rear compared to the front, "flex-wise."

Well I did some math and figured out how to set them up to work the best. It defenatly mad a differance in flex I got about 7.5" more than before, Thanks for all of the HELP Guys :D
Nick