Difficulty getting through to the parts department? Looking for electrical 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! To log-in to the Customer Portal Click Here. Read more about Customer Portal here. Interested, give our parts department a call at any time to get set up.