Truck Transmissions (The M6): 6- to 21-speed gearboxes for trucks for Euro Truck Simulator 2
Adds 6, 10, 13, 15, 18 and 21-speed gearboxes, with or without retarder, to over 60 SCS and modded trucks. The author confirms it works on 1.58. Version 1.3.31.
Download Truck Transmissions (The M6): 6- to 21-speed gearboxes for trucks
Official screenshots by the author: © The M6 on Steam WorkshopMore screenshots on Steam Workshop ↗
What this mod does
Truck Transmissions is a mod by The M6 that adds new gearboxes to the service shop, with ratios and differentials different from the stock ones. It lets you fine-tune your truck for the load and route, from simple gearboxes to setups with lots of gears.
Included gearboxes
- 6, 10, 13, 15, 18 and 21 speeds, each with or without retarder.
- The 21-speed has a normal variant and a high-speed one, which according to the author reaches about 200 km/h if the engine has enough power.
Compatible trucks
The author lists over 60 models from DAF, Iveco, Ford, Freightliner, Mack, MAN, Mercedes-Benz, Renault, Scania, Sisu, Tesla, Volkswagen and Volvo. That includes the SCS trucks and several from free mods, like Snarfv’s DAF XF Electric and Scania S BEV, N4RCOS’s Renault E-Tech T and Johnny244’s Volvo FH3. Paid truck mods aren’t supported. Truck requests go in the comments.
Version
Version 1.3.31 is from November 25, 2025. According to the description, it should work on all versions unless SCS changes the game’s structure, and on February 28, 2026 the author confirmed it works with 1.58. It’s compatible with Convoy. One user notes that shifts are a bit slow in the low gears.
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User rating
Our rating
0.0 / 5- Lots of different gearboxes to tune your truck
- Over 60 compatible trucks, including modded ones
- Author maintains it and replies
- Shifts can be slow in the low gears, according to a user
- The high-speed gearbox only reaches about 200 km/h with a powerful engine
- Latest game version confirmed by the author: 1.58. It may cause errors in 1.61; Holyfix will let you know if so.
- Unofficial mod: trademarks belong to their owners; neither Holymod nor the author is affiliated with them
Requirements
- Euro Truck Simulator 2 (confirmed by the author on 1.58)
- No DLC needed; compatible modded trucks are installed separately
How to install it
- Open the mod's page on Steam Workshop and click Subscribe.
- Launch ETS2, open the Mod Manager and enable the mod.
- Take your truck to the service shop and go to the transmission section.
- Pick the gearbox you want, with or without retarder.
Common problems
Which gearboxes does it include?
6, 10, 13, 15, 18 and 21 speeds, with or without retarder.
Does it work with modded trucks?
With the ones the author lists, all free; not with paid mods.
Does it work in Convoy?
Yes, the author says it's compatible.
Is there an ATS version?
Not for now; the author says he doesn't have time for both.
More mods for ETS2
✓ ETS2 1.61 
Requires DLC 
ETS2 1.60 
ETS2 1.58 