i have a 94 f150 4x4 5 speed. i noticed when im in gear and im at very low rpms trying to accelerate i can hear a very slight grinding noise. this is because when im turning at a slow speed trying to take a corner up a small hill i usually put it in second since my first is a granny gear. sometimes happens when im in second going through a parking lot. could this be the flywheel? it cant be the transmission because the whole thing was rebuilt 20kish miles ago. It cant be the way i drive because i am very experienced with a clutch.