Manual Transmission Diagnosis Technical: Truck Drivetrain Specialist Module 1/1   Vehicle down time is a concern to all commercial customers—it affects their operating costs. Paying for preventive maintenance and knowledgeable service professionals to service and repair their equipment accurately and quickly, is a value to them. With correctly trained technicians, this area is an easy way to increase your shop’s customer base and revenue. This course offers technicians the knowledge on how to properly maintain and repair many manual transmission concerns.