Difficulty getting through to the parts departement? Looking for elecrtical information and schematics? Torque specifications and other service related information? Sign up for Mack Customer Portal and alleviate some of these concerns. Customer Portal in conjunction with MV Select allows you to look up your specific part number by VIN and then see if we have it in stock! Read more about Customer Portal here. Interested, click here and we will get you all set up!