Too Many coils in the spring making the spring too tall. Thats the only thing I can determine.
I'm using Heidits full lower "economy" A arms in my front end. When you look at the swing arc of the lower arm and the resulting pocket area for the spring when the arms are parallel to the crossmember, It is easy to see that the compressed area is much shorter than the "stock" height of the front springs. The more coils a spring has to compress to fit in this area, the more force it takes to compress and squeeze it in. By the time you get them in, the engine and vehicle weight doesn't provide the required force to compress them any further. The only solution is to start cutting on the coils. The less spring there is, the less force required to compress it. The spring rate is lowered enough to where the vehicle weight provides enough force along with inertia to move the springs like they should giving it a bounce. At least thats my throery.
Heidits mentions in their instructions for their weld in crossmember that the front springs be cut down 1/4 coil at a time untill the correct ride height is achieved ( lower arms parallel).
I too was somewhat aprehensive about cutting coils. But after I got them on for the first time, I knew this arrangement would not work. I took the plunge and cut em to fit. Don't be scared to do this if things are not working out like they should.
This is what mine looked like before I cut them. You can tell there is too much spring to fit in the "pocket". The springs were even touching the shocks! The suspension didn't move a whole lot after i put it on the ground. My dad and i even put our wieght on both sides and it still didn't move much more. After I cut one coil off each spring, They fit a whole lot better and they had bounce in them.
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