when i bought my 72 chevelle conv. i pulled the orig 12 bolt 373 rear and  replaced with a 12 bolt 331 limted slip rear so i could drive wile rebiulding orig drivetrain and i have had it in for 5 years now lol and taken trips and drove every day in the summer in the city and country still will get up n fly and dosent hurty my wallet bad on fuel im not really ready to put the orig big block and tranny/rear back rite now lol im happy with that rear set up

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