Check the listing for details. 2 SPEED REAR AXLE DIAPHRAGM GM#3847058 BENDIX#374451. Condition: New. Listed at 35.00 USD. GM 3847058 2 SPEED DIAPHRAGM This is a brand new diaphragm manufactured for www.rebuildersenterprises.comFits GM 2 speed rear axles, Also replaces Bendix 374451.O.D. is approx 7" I.D. is approx 3" To see if this unit will fit your application or for technical assistance, feel free to call 800-489-9860.Rebuilders Enterprises, Inc. is Illinois' Original Remanufacturing Company Specializing in Air Brake Components including:Air CompressorsAir dryersAir ValvesFan Clutches Air over Hydraulic Brake DevicesAir Wiper Motors We are also Illinois' largest remanufacturer ofSteering Gear Boxes and Pumps Don't forget A/C compressors including: Carrier and Thermo King Whether you're servicing a single truck or an entire fleet, REI is ready to meet your parts needs!