Alright guys here's my take on 2.9 ticking, First I tried, marvel Mystery oil. oil of all different viscosities, all brands of filters, "lifter quiet" additive, Lucas, Etc, etc, I even changed the cam and lifters and rokers and shafts,STLL TICKED, I even tried an oiler cooler. The answer was a new oil pump. It seems these engines need volume. Oil pressure "idiot gauge" said I had good pressure. but the ford manual says you should have 40-60 psi at 2k rpms warm. I installed an aux pressure gauge and sure enough I had like 27psi at 2k rpms warm. On a 4x4 it's, lets just say changing the oil pump is a pain in the neck, to put it nicely. Its a wordy post but I hope someone finds it helpful.