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Detroit Truetrac DL913A555 Product:Suit GM 8-7/8" 12-Bolt 30-Spline 12-Point S/Sfits ChevDetroit TruetracSuit GM 8 7 8" 12 Bolt 30 Spline DL913A555 913A555 The Detroit Truetrac was the first helical gear differential ever introduced into the automotive aftermarket as an Eaton brand. It remains the leading helical gear type limited slip differential in the industry. Detroit Truetrac's proven helical gear design eliminates the need for wearable parts, resulting in maintenance free traction recognized not only for its toughness, but its