Transform Your Peterbilt 389 Day Cab with DC-Max Extensions: A Step-by-Step Guide

Peterbilt may have retired its iconic model 389 in May of 2023, but this powerful rig still dominates the highways with its unforgettable profile and rugged dependability. One of the most popular features of the Peterbilt 389 day cab is its ability to be easily customized to meet a wide range of requirements and personalities. DC-Max Extensions allow you to transform your Peterbilt 389 into the rig of your dreams in as little as a day.  

Quick, Easy, and Satisfying 

At DC-Max, we have developed state-of-the-art cab extension systems that seamlessly integrate onto your Peterbilt 389 day cab truck with weatherproof seals that ensure long-term durability. Our specially designed and manufactured lightweight composite panels and self-locating integration ring make installation a breeze, allowing you to extend your day cab in as little as a day. We make it easy to get those few extra inches that make a big difference.

Transforming Your Peterbilt 389 Day Cab 

We know how important it is to keep your wheels rolling, which is why we have developed our advanced extension system that allows you to quickly transform your Peterbilt 389 day cab into the extended semi-truck you’ve always wanted. Whether you need just a few more inches to alleviate those sore knees or a place to stretch out between runs, use the following guide to quickly install your DC-Max extension.

Necessary Tools

  • Putty Knife
  • Sawzall
  • Drill
  • Caulking Gun
  • Lift Assistance 

Step-by-Step

  1. Remove back wall components such as windows, visors, access doors, and lightbars.
  2. Fasten the self-locating integration ring to the back wall and then remove?
  3. Apply a continuous bead of the aerospace-quality bonding material along the inner track of the integration ring. 
  4. Reinstall the integration ring onto the back wall. 
  5. Drill, cut, and remove the back wall using the integration ring as a template.
  6. Apply another continuous bead of the specialized bonding material to the box. 
  7. Align the box with the integration ring and bolt securely to the cab.
  8. Install cover trim and additional custom storage solutions.
  9. Get back to work!

Because a Few Inches Makes a Big Difference

Peterbilt 389 day cabs are one of the most reliable and dependable models on the road today; however, day cabs, in general, are cramped with little storage space for vital equipment, personal belongings, and essential tools. DC-Max extensions are an easy-to-install solution that will have you back on the road in no time. Contact us today to learn more or request your quote to get started.