I have a 1970 Impala, 383 at about 410hp and the same torque. Running a th 350 with 3:55 gears. Im at 3000 rpm at 60 mph. Trying to loose some rpms at highway speed. I thought about gear vendors and a 700 r4 but thought because the 2004r is an exact swap it just makes sense. But is it strong enough? Dose anybody have any input. Thanks in advance, Trainor