- Microwave for the interior
- Cummins ISX15 engine sound from the SCS 9900i
Interiors are customizable:
- Standard Ultra Ride
- Light Ultra Ride
- Tan Ultra Ride
- Premium Ultra Ride
Author-designed interiors (not customizable):
- Heritage X (based on the Limited Edition 379X)
- Phil Hall Design (designed by lead Peterbilt designer Phil Hall)
- 2023 Ultra Ride (original design for the 2023 model year)
- Noire (inspired by the TV series Twin Peaks)
- Gray Space
- Prestige Tan
- Prestige Gray
- 389X (flat top only)

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