I recently jacked up yhe rear end of my truck to rotate tires & noticed oil running out of the inspection slot in the bell housing. It appeared to be trans oil. Took it to dealer & of course they can't find anything. I waited a few weeks & jacked the truck up again, again oil ran out of slot. This time I video taped it. Took truck back & had them raise rear of truck & of course nothing happens. Showed them the tape & was told that until they see it themselves there is nothing they can do. Imagine that. It happens after a few days of driving, Rear wheels off the ground about 3" & it doesn't drain much, about a 3-4" dia. circle on floor. I checked the oil level & its barely below the filler hole. Has anyone else had this problem or have any suggestions. I think it's the input shaft seal but dealer refuses to pull trans. to investigate. Thanks