Got it! Here's what I just did.... got in the truck started it put it in reverse, then drive, then reverse, the drove 10 feet in drive to enter my garage. Put it in park, left the engine running, dove under the truck, had a hard time removing the nut but got it after a minute. NOTHING WAS COMING OUT!!!!!. So got out from under the truck which was still idling, went to my workbench to get my oil, had a hard time getting my oil transfer device to work, but after a few minutes of struggling, it finally worked. About 3/4of a bottle went in!!! Then I removed the tube from the filler hole wich was somewhat blocking the exit of oil, and as the oil was coming out, I reinstalled the nut. I know that the amount coming out was more than a 1/8 inch , more like a good 1/4 inch.

So I was underfilled. Sure glad I checked it out. Thanks Mike!