Changed the oil in my trans for the first time today at 82000 miles. Used the bottom pto cover bolt for a drain, noticeing there is alot of transmission below the level of this bolt. I don't think I got all the oil out of the transmission because when refilling it it did not take a whole gallon, had about 15 to 20 oz left. There is a nice looking boss on the end of the transmission that looks like if the drain were there it would drain the whole thing, go figure. Anybody else run into this?