Auxiliary Transmission

Fleet maintenance means staying ahead of wear before it causes downtime. One area that deserves closer attention is the auxiliary transmission. At ATG Truck Parts, we stock genuine Freightliner auxiliary transmission parts designed to deliver long-term value and durability. Using parts built for your truck’s exact setup helps you avoid small problems that become expensive fast.

Why auxiliary transmission systems matter

Auxiliary transmissions provide extra gear ranges or functions beyond the main transmission. These systems are especially useful in commercial vehicles, where torque needs can change based on load, speed, or terrain. They help manage power distribution more precisely, reducing strain on the main drivetrain. When everything runs right, the truck stays smooth under pressure.

When problems start to show

Auxiliary transmission issues usually start with worn gears, leaks, or shifting delays. Ignoring these signs can cause failures in the entire driveline. Replacing a failed part with an aftermarket brand often means sacrificing quality, fit, and longevity. We carry only genuine Freightliner parts built to match your vehicle’s engineering and maintain shift integrity across conditions.

Consider your input shaft seal as well

Any time work is done on the auxiliary transmission, it's smart to check the input shaft seal. A damaged or dry seal can lead to fluid loss and bigger mechanical issues down the line. Using Freightliner OEM replacements ensures the right seal, every time.