Swapped out my lash adjusters today and was very dissapointed that it didn't resolve my noisey lifter issue. I must have a restriction in the oil passage then.?.? I added some ATF in my oil and will put a few miles on it this week to see if I can't break it up. I still haven't found my air leak either and it looks like I my rear main seal is leaking too so I may just yank the motor next weekend, tear it down again and go thru it a little more thoroughly this time.
Gaining experience the hard way sucks.
My wife is threatening to buy me another truck but I really want to resolve this and put another 250K miles on this one.