( TCI-240900 ) - Torque converter for GM 350/400 THM transmissions "Breakaway" should stall at 2200 to 2400rpm with a small block engine 2400 to 2600rpm with a big block engine excellent converter for 265 to 280 duration cam very driveable with 3.00 to 3.73 gears an auxillary transmission cooler is always recommended with a higher than stock stall-speed converter, or if using the vehicle for "hard-use" or "heavy-duty" applications. refer to transmission coolers section for recommendations