The only problem my tranny has is when I am in OD going about 55-60 and start to go up hill and give it a little bit of gas, NOT enough to make it downshift just enough to let it maintain speed, my tranny appears to slip. My RPM's just from about 1.5k to 2.5k... Some one on here had said it might be a plug/wire/coil problem. Is that true? My tranny has 225k on it....