Have a motorsport clutch that i put in when i got the car about 6 months ago. when cold, its a dream, lets up about halfway from the floor and has a good feel. however, when hot it gets much stiffer and and barely lets up at the floor! i have to press it through the floor it seems just to shift. i checked out the cable and its fine, although the mounting bracket to the frame was snapped off. i replaced the bracket and its a little better, but still horrible when hot. What could this be? its really becomeing a PITA! also, when changing the fluid i used dexron III as stated in the manual and on here, is that correct? TIA