Consistent transbrake release is mandatory for a successful ET racing effort. To improve transbrake release, rebuilders typically replace the OE return springs with stiffer springs, such as the Sonnax 28320A reverse clutch return springs. These extra-stiff springs can deflect the OE retainer, resulting in a loss of intended load. The Sonnax heavy duty reverse clutch spring retainer 28709 is stamped from high strength, roll tempered steel. This additional strength resists deflection better than used OE retainers made of mild steel. For optimum reverse clutch release, use Sonnax 28320A reverse springs with the 28709 retainer.