740s do not have an overdrive. Under normal acceleration on a flat road, my 740 shift into 2nd at about 15-20 MPH, 3rd at about 30-35 MPH and into 4th at about 45-50 MPH. Shifts (up & down) are sometimes harsher, sometime softer. Has been this way since we purchased the coach 6 1/2 years and 30,000 miles ago. Jack
the bus in a 80 model prevost lemirage with a 8v71 with a 740 4 speed auto.