There were warnings about military vs civilian rear main seals, but as I recall the civilian ones were too tight. So tight in fact, they were causing rear bearing problems and leakage because of the amount of heat. Since then, some dealers have had proper rear main seals made up.
That warning aside, I have had it where the rear main seals take a little bit of time to set in. And they can be replaced while on the vehicle. I used to do them in about an hour, although it almost takes me that long to get onto the floor and back up again these days.
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