I doubt it's the problem (trany fluid) but If I were you, this would be a great time to change it. Buy 2 qts of 10w-40 motor oil. Drain the tranny from the bolt that has a square hole for your 3/8ths ratchet. Replug the drain and then fill the tranny with a funnel and hose untill it runs out of the filler hole (17mm bolt that is above and behind the drain hole).

More than likely, it's your clutch fluid. Have you look for what I said in my last reply yet?