Well I have an update. Pulled the pan and replaced the the oil pump. Noticed that the old pump had some wear on the shaft bushings, I was sure this was my problem,put the new pump put fresh oil and filter turned her on and ran it for a while till the temp got to about 180. It has good pressure when truck is cold but once it gets to operating temp it drops to about 25#'s. any other suggestions? I am going to get the front stucture redone as it is leaking oil would it be wise to replace cam bearings in it? this has me stumped.