I have a jeep wrangeler 4.0 L 1999 I am having trubel whith lose of power on hills I am haveing to put it in 3rd on hills that I used to pull in 5th I have ck. All dis whiers and dis. And all the con. It idels ok and rev. Ok it soundes like it is muffeld when you put a load to it I need a good place to start.