Join Date: Mar 2002
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Do you mind if I ask a question? Why did you decide to do a spoa, and how many inches over stock are you planning on going? I'm not sure I'd want to do one. Well, not yet.
I'm about five inches over stock, measuring from the top of front axle to frame. With a spua suspension, I can stuff 30x9.5 tires into a wheel well and have no rub anywhere. That's with 23" of wheel travel.
My point is that unless your running 33's, I'd keep it sprung under and go with Wrangler springs. I think it's a good setup with the 30" tires.
To answer your question about pinion angle on front axle. Your right; it will affect your steering. The farther you move the caster (I think that's what it's called) away from pretty much straight up and down, the more you affect your steering. Turning radius will increase. I don't know the spec's, but I don't think it should be changed more than a degree or two. Your definitely going to need some way to control the axle wrap also. Something else to contend with spoa.
Either way, good luck with your project.