Brand One Automatic Transmission Instant Shudder Fix Synthetic Additive 3 pack A concentrated friction modifier formulated specifically for instantly eliminating torque converter lock-up shudder. For use in any automatic transmission fluid. Not for use in Ford Type F or CVT applications. This formulation of friction modifiers made of synthetics and synthetic esters is concentrated five times! Two ounce application tube Brand One Instant Shudder Fix is compatible with conventional or synthetic automatic transmission fluids.