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All GM 10-bolt rearends built after 1972 use a stronger 8.5-inch ring gear, which will handle a significant amount of torque. Instead of throwing it away and putting in a pricey 9-inch or a 12-bolt, we decided to keep the 10-bolt. To bring it up to strength, we installed an Eaton TrueTrac posi, which is bulletproof in the burn-box and at the starting line. It also lays down torque evenly in the twisties without showing any bad manners.