Dropped the pan pulled a main bearing look ok a little scuffed.
I am clue less why I lost my oil pressure I blew air there everything and it was fine.. Im trying to find some type of schematic of the motor to understand how the oil systems work. Does any body know were it can be found??? Please advise>> thanks Howard

 

Hope this helps, and sorry to hear about your luck

 

truck runs fine no oil anywhere under the truck. ive heard of blowing a hole in the piston and it blasting oil out the dipstick or out the vent. maybe someone drained your oil and put the plug back in? do you have any enemies?

 

I broke a key one time on a ntc big cam in the oil pump drive gear 0 oil pres. instantly,also the rod bearings will be worse than the mains,pull it down and check. With the oil pump key sheared you can't see it till you take the pump apart.

 

^^ that was my next guess is, maybe the gear is spinning on the shaft.