Oil pan is leaking excessively from cotter pin and a seam along the housing. I've attached a few pictures to review. Any suggestions short of having to pull the engine/trans?
I was able to take the bolts out of the front & rear mounts, jack up the motor with a board under the front pulley and get my pan off, I think I had to drop the tie rod also, that was on a '50 sedan, not sure about your truck.
Concur with comments of JSeery.
Point worth considering is to look at what has recently been done or played with on this engine, whether its a recent oil change etc etc as this can be a clue as to new problems such as your oil leakage.
Hope is just a simple cure like oil overfill.
all the best
Phil NZ
There is a die cast insert that fits into the rear main bearing cap and block. Could possibly have disintegrated. I have encountered the very same problem.