Ok guys, so my old 2000 mustang had a t45, and it shifter altirhgt till i put rp sychromax in it and it made it much better.., now i have a new stang, an 03.. the 1/2 clunk is killing me... What the best fluid i could use to some what make the situation better.... the car has 45,000 miles on it , with original transmission fluid.