ok so if 4th gear splines are toaste the car wont ever let it drive in 4th ? so if splines are bad you will never have it slip in 4th ?im postive 4th is there becuse if i downshift from drive it drops a gear and puts it in 3rd. so if 4th is gone you will never have a slipping effect? it just tell the trans to never let it be driven in 4th?