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try to get it within 2-3 degrees of the transmission. i spaced my trans up 1" to help. make your bars as long as possible (keeps the arch of suspension longer which in turn lessens the rearend movement front to back), try to keep them as close to the same overall length as possible (it'll keep the pinion angle the same throughout travel), set everything up at ride height and keep in mind your anti-squat.
i would check yours and not base it off mine, it seems every truck it diff. mine are under-ish the frame, there's a pocket welded into the side of the frame so the bag is directly over the bar.Ok so spacing the trans up 1" and set the pinion angle so its neg. 2 or 3 degs.. my lowers are the same as your I'm sure cuz they mount to the stock front leaf spring hanger. My bags are under the frame not mounted to the side of the frame like yours..