These hi-rate direct clutch apply/release spring are engineered specifically for hi-output TH400 applications. The additional spring force requires that a higher clutch apply pressure value be reached in the direct clutch circuit before the clutch piston can overcome the opposing spring force and apply the clutch pack. This results in increased intermediate clutch pack torque capacity furnishing quicker and firmer shifts with reduced slippage. These springs will also improve transbrake set up, transbrake reaction time, reduce centrifugical apply of the direct clutch, also speed up direct clutch release during automatic, forced or manual 3-2 downshifts. Furnishes improvements you can feel.