Hi, I have a stock yj jeep that I reasently that I took under water about an inch above the bumper. Getting back on the road the transmission would not down shift, it soon fixed it's self and started working and shifting probably. The next day I was on a trip about 45mins from my house. The trans started sliping making so the Jeep couldn't move. Now driving it, I can get to about 25 before it slips than won't grab again. I tried adding ATF and nothing helped. Any ideas what could be wrong?