2,600 RPM Stall. The 70 Series of torque converters are some of the most prolific converters ever manufactured under our roof for the Allison transmission. These converters drive a feel almost stock at part throttle, but once you start leaning on the throttle heavily, watch out! The 1073 is a dual-purpose converter that can be used for towing moderate loads and also works great with street/strip use. The perfect candidate for this torque converter would be a completely stock truck to a heavily modified one that is looking for that magical "best of both worlds."