I'm new to the forum starting today. My situation is similar to VAredRAM's except that I have an '09 Ram 3500HD 4WD SRW pickup. I made an assumption that I'd be able to carry the AF990 w/o any issues...
Drop your air bag pressure down,90lbs is way to much. I would start at about 25 lbs and add more if needed. You need to load your springs not the bags to carry the load. Plus with the SRW put your tire pressures to the max 80 psi.