My tip would be to not do it. The assy you are using is too wide for the AD series. I have never seen a definitive step by step process for this but the results I have seen have had the tires sticking outside the fenders by at least an inch. Unless you are raising the truck up this will result in crumpled fenders. I did see one person who took some meat out of the center of the crossmember and re-welded it. The result would be most likely custom engine mounts.
If you have it under your truck now, stop and put your fenders on. If you like the look then go for it. Who am I to say you should not.
