i have a 1987 Ford Mustang lx with a built 306 swap with a c4 trans . i have a 4.56 gear in it now if i get a 3.73 does any one know if it will save me gas because its my daily driver and im tired of stoping at the gas station 3 times a week.
Yes 3.73 gears will definitely give you better gas mileage, especially if you are driving on the interstate a lot. It will also prevent you from prematurely wearing out your engine by lowering your RPM at least 500 to 600 highway speeds, maybe even more than that. This is just my opinion of course from years of personal experience.