"The maximum stall on a factory GM 5.3L torque converter is 1,600 rpms and the shifts drop approximately 2,200 rpms between shifts. With the new Yank Truck Thruster 2600 torque converter, your 5.3 engine will now stall 2,600 rpms and the 2.1 stall toque ratio will multiply more starting line torque than the factory 1.9 STR. 0-60 acceleration times will drop from 0.3-0.4 seconds! To keep the engine more in the sweet spot of its power-band, the Truck Thruster 2600 converter only allows the shifts to drop 1900 rpms between gear changes. For example, an engine that shifts from 1st gear at 5500 rpms will drop to 3,300 rpms in 2nd gear with the stock torque converter. With the Truck Thruster 2600, the rpms would only drop to 3,600...a nice boost!"