BD Diesel Performance Transmission Part Number: BDD1064234F Performance Transmission Type Of Transmission= 48RE Number Of Speeds=4 Torqueconverter= Optional 2 Or 4 Wheel Drive Output= 4 BD transmissions are built specifically to handle the high torque loads of diesel engines at our state-of-the-art transmission facility. We re-program the valve body for higher line pressure, and add heavy-duty clutches with up to 25% more material than stock. The stock thrust washers, which disintegrate and leave metal filings in your transmission, are replaced with roller Torrington bearings.