All of the gear drive rears are basically identical with the exception of brake configuration from 70-582. They can even be used on later 82 series tractors built by MTD. They were internal brake from the 70 through the 1x4/5 series, external brake from the 1x6/7 series until partway through the QL series, when they switched back to internal brakes. MTD went back to external brakes with the aluminum rearends.
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