HOLYMOD
American Truck Simulator Physics Free

Ford Mustang Engine and transmission pack (Stevica Sin) for American Truck Simulator

FE 390 and 427 big-block V8s for the Road Trip: Ford Mustang 1967, with 4-speed Toploader and 6-speed Tremec T-56 gearboxes. A small mod by Stevica Sin, free on Steam Workshop.

Author: Stevica Sin Compatible: ATS 1.61 (released Sep 29 and updated Sep 30, 2026; the author doesn't state a game version) Updated: 30 Sep 2026 Reviewed: 24 Oct 2026
Download Ford Mustang Engine and transmission pack (Stevica Sin)
Ford Mustang Engine and transmission pack (Stevica Sin) for American Truck Simulator © Stevica Sin on Steam Workshop

More screenshots on Steam Workshop ↗

What this mod does

The Mustang 1967 from the Road Trip: Ford DLC comes from the factory with the 289. Ford Mustang Engine and transmission pack, by Stevica Sin, adds the FE big-block V8s and revises the transmission. It uses the game’s stock sound, so it doesn’t change how the car sounds.

Engines

  • 390 FE V8: 375 HP.
  • 427 FE Side-Oiler V8: 425 HP.

Transmissions

  • 4-speed Toploader with a 3.50 differential (close ratio) or 3.25, 2.75 and 2.50 (wide ratio).
  • 6-speed Tremec T-56 with a sporty 4.10 or short 4.56 differential.

What users say

Fuel consumption goes way up: one player had to call for emergency refueling three times on short trips. Another says that, with adaptive transmission on maximum power, the 4-speed Toploader shifts too early and doesn’t go past about 3,000 rpm. It’s a file of just 72 KB, containing only definitions. If you want the engine to sound different, combine it with a Mustang sound mod, such as the one by Slav Jerry. The author doesn’t mention Convoy or load order.

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Highlights and things to keep in mind

Highlights
  • Classic Mustang engines
  • Several differential ratios
  • Tiny file
Keep in mind
  • Requires the Road Trip: Ford DLC
  • Very high fuel consumption according to users
  • The Toploader may shift too early in automatic

Requirements

  • American Truck Simulator (released while 1.61 was current)
  • Road Trip: Ford DLC
  • Steam account

How to install it

  1. Open the "Ford Mustang Engine and transmission pack" page on Steam Workshop and click "Subscribe".
  2. Launch American Truck Simulator and wait for Steam to finish downloading the mod.
  3. Open the Mod Manager in your profile and enable "Ford Mustang Engine and transmission pack".
  4. Take the Mustang 1967 to the service shop and pick the 390 or the 427 and the transmission you prefer.
  5. If fuel consumption seems excessive, go back to the stock engine.

Version history

  1. 30 Sep 2026Current

    Latest update (the change log has 4 notes)

  2. 29 Sep 2026

    Release

Common problems

How much power do they have?

375 HP for the 390 FE and 425 HP for the 427 Side-Oiler.

Does it change the sound?

No: it uses the game's stock sound.

Does it burn more fuel?

Yes, several users notice much higher consumption.

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