FS25 Realistic 4×4 Traction System V1.4

Multiplayer in development, playable but may contain bugs
Take real control of your tractor’s traction — engage 4×4, lock the differential and let the system react to actual wheel slip, not just to an assigned key.

This mod adds a fully switchable 4×4 traction system to compatible vehicles (tractors, trucks, harvesters, cars): engage/disengage the front axle when needed and toggle a differential lock that trades turning radius for maximum grip in mud, snow or during heavy work.

Features
Real rear-wheel slip detection — automatic modes react to actual wheel-slip physics, not just speed
Four driving modes, assigned to each vehicle by default:
Manual — always in control
Semi-automatic — engages with actual wheel slip, while manual control is always available
Automatic — the same logic, adjusted for vehicles with factory-fitted automatic 4WD (CVT/IVT transmissions)
Intelligent — continuous, proportional engagement in the Fendt style (without abrupt switching on/off)
Native tyre-pressure simulation during engagement — no dependency on any other mod
On-screen HUD with real-time status and adjustable position in the game Settings menu
Zero XML changes to any vehicle — the system integrates automatically into all compatible vehicles

V1.4.0.0
New
– Physical traction prediction (tractors with GPS): compares the required force (slope, rolling resistance, effort from LOWERED implements) with rear axle grip, according to the soil type and ground moisture.
– Front axle engagement by clutch on a ramp (~0.4 s), without jolts.
– Differential lock in 3 positions (Ctrl+K): open / rear / rear + front, with progressive engagement.
– Auto/smart: engages with the implement lowered in the field, when wheels are slipping, downhill with a load and at low speed under load; disengages during tight headland turns and at road speed; remains engaged for at least 6 s (no “flashing on and off”).
– Automatic locks while working; they release when turning, braking or above 15 km/h (in all modes, for safety).
– Maximum speed with 4×4 engaged: 25 km/h (tractors/harvesters), 40 km/h (trucks/cars).
– No mode engages 4×4 above 20 km/h, not even with Ctrl+J.
– Tyre pressure (Fendt) follows field/road conditions, like the real VarioGrip.
– New HUD: live wheel slip, padlocks on locked axles and the REASON for each decision;

Fixed
– The terrain prediction remained high (e.g. 27%) simply because a heavy implement was attached, even when lifted.
– Braking activated 4×4 and the locks (wheel slip while braking no longer counted as a lack of traction).
– Multiplayer: Ctrl+J in automatic modes was undone by the dedicated server.
– Semi-automatic mode never disengages on its own (only the player can do so).

 

[FarmerBoy]

Thank you for sharing the details of the "Realistic 4x4 Traction System V1.4" mod for FS25! This mod seems to enhance the gameplay experience by adding a comprehensive and realistic traction system to compatible vehicles. The addition of features like real rear-wheel slip detection, multiple driving modes, and intelligent engagement options truly elevates the immersion and realism of the game.

The new additions in V1.4.0.0, such as physical traction prediction for tractors with GPS, front axle engagement without jolts, differential lock positions, automatic engagement based on various conditions, speed limitations, and improved HUD display, further enhance the functionality and realism of the mod.

It's great to see that the modders have also addressed issues like inaccurate terrain prediction, unintended engagement of 4x4 and locks, multiplayer bugs, and the behavior of semi-automatic mode in this update. These fixes ensure a smoother and more realistic experience for players using the mod.

Overall, the detailed features and improvements in this mod showcase the dedication of the modding team to providing a realistic and engaging gameplay experience for players who enjoy the simulation aspect of FS25. Players will undoubtedly appreciate the level of detail and immersion that this mod adds to their virtual farming or driving experience.