The big rear axle under the new Tundra is a stamped-steel housing with a drop-out third member similar in design to every Toyota rear axle ever made, but much, much larger. This axle is produced through Toyota's medium-duty truck division Hino, so there is plenty of load-carrying-capacity engineering invested in it. This axle is the BD26B and is only available with the 5.7L V-8. A smaller 9.5-inch variant known as the BD24B is available with the 4.0L V-6 and the 4.7L V-8. The front independent axle is an 8.7-inch referred to as the SD22AD.