: Many 379X units were spec'd with heavy-hitting engines of the era, such as the Caterpillar C15 Accert .

: Features included a polished aluminum grille, chrome-plated bumper, and stainless steel sun visor.

The is a limited-edition legendary truck that serves as the ultimate tribute to the flagship 379 model before its transition to the 389. Introduced in September 2003, it was designed to be the "owner-operator's dream," combining classic "long-nose" styling with a massive amount of factory-installed chrome and custom features. The Chrome King: Visual Identity

Inside, the 379X was just as distinct. Peterbilt marketed it with a "rugged but refined" aesthetic:

: Enthusiasts often use these frames for massive frame stretches , reaching wheelbases of over 330 inches for a truly "stretched" custom appearance. Collecting and Customizing