2026 Mack MD6 , Cummins B6.7 260 H.P. , Allison 2500 RDS , This is a new " GEN 2 " Chassis see your salesman for all the improvements Mack has made to this chassis ! Ready for sale. M&K Truck Centers partners with the best Medium Duty manufacturers in the industry. Call us today for pricing and additional spec details, our professional sales team will help you find a Mack truck that is a perfect fit for you. M&K also offers a full range of financing options that will help to make your truck purchase affordable. (Disclaimer: Although our online marketing team has made substantial effort to provide accurate and complete information on this website, please contact one of our qualified professional sales team members to verify availability / pricing / specifications of the information online.) EngineModel: ISB 6.7