Pro Street 11" stall converter to fit GM th350 and th400 transmissions. It will also fit modified aluminum case powerglides which have a 350 style input shaft. This is a 11" converter that is great for everyday street driven vehicles. Enough stall for a good launch but not to radical for daily driving. This converter has 3 bearings eliminating all washers. Has a brazed impellor and stator for more durability and torque.