What is the rear differential brand on a 1962 Chevy impala?

A 1962 Chevy Impala could have come with a rear differential from either Chevrolet or GM. There wasn't a separate, branded aftermarket differential typically installed at the factory. The specific type (e.g., 8.2-inch, 10-bolt, 12-bolt) would depend on the trim level and options selected. The brand name wouldn't be prominently displayed on the differential itself, unlike some aftermarket parts.