Ram heavy-duty trucks have not completely stopped using the Aisin heavy-duty automatic transmission, as the high-output Cummins diesel engine configurations in Ram 3500 series trucks continue to offer the commercial-grade Aisin AS69RC transmission as a specialized towing option. While standard-output Cummins engines transitioned to ZF-sourced transmissions over various production cycles, the heavy-duty Aisin option remains integrated into Ram's commercial towing lineup.