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Detroit TruetracSuit 1971-89 GM 10-Bolt 8.5", 2.73 Ratio & UpDL912A556912A556The Detroit Truetrac is a helical-gear style, limited-slip differe...
View full detailsDetroit TruetracSuit GM 8-7/8" 12-Bolt 30-SplineDL913A555913A555The Detroit Truetrac was the first helical gear differential ever introduced into t...
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