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ZL1 gears will not fit. Diff is larger. 9.9 inch with cast iron housing I believe. LPE gears are manufactured by American Axle & Manufacturing (AAM). This is who makes the Camaro diff including gears so LPE gears are actually GM OEM quality. Just put LPE 3.93 gears in my SS, but did a lot of other upgrades and don't have it all back together yet.
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