Download
Download GP Transco (Truck Designs) for American Truck Simulator
You're leaving Holymod for Steam Workshop, the mod's official source. First, check you have everything so it works the first time.
Before you download
- American Truck Simulator (no version listed; updated in October 2025)
- Steam account
- Freightliner Cascadia DLC for the truck paintjobs
All set
Continue to Steam Workshop Destination: Steam Workshop · opens in a new tab No waiting or countdowns. Holymod doesn't host files.After downloading
- Launch American Truck Simulator and wait for Steam to finish downloading the mod.
- Open your profile's Mod Manager and enable “GP Transco”.
- Go to a service shop and pick the GP Transco paintjob on the Cascadia 2019 or 2024.
- For the trailer, buy a 45 or 48 ft SCS dry van and apply the livery.
Holyfix Check
Will it work with your mods?
Load your game.log.txt and check whether this mod is for your ATS version, whether you're missing a mod or DLC it needs and where to place it.
Choose game.log.txtor drop it here
It's in Documents › American Truck Simulator › game.log.txt. It's read in your browser: the file is never uploaded.
Something else failing? Holyfix for ATS checks all your mods at once.