Realistic 4x4 Traction System FS25

REUPLOADING TO OTHER SITES IS PROHIBITED WITHOUT MY CONSENT!! Multiplayer in development, playable but may contain bugs Take real control of your tractor’s traction — engage 4x4, lock the differential and let the system react to actual wheel slip, not just to an assigned key. This mod adds a fully switchable 4x4 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
NEW / FIXED - Differentials now really work: rebuilt on the drivetrain node exactly like the game creates them (in FS25 the locks previously had no effect) - Separate FRONT / CENTER / REAR diff locks (Ctrl+Alt+K / Ctrl+Alt+J / Ctrl+Alt+L) + quick cycle (Ctrl+K) — all rebindable - Locked center respects the real front-axle lead (tyre size ratio + 2.5%): no more rear wheels spinning while the front axle brakes the tractor - 2WD leaves the front axle free - CTIS tyre pressure per axle from the real axle load and tyre load tables (with Soil Draft Physics); realistic -3.5% rolling radius instead of -15% (no more "flat" tyres) - CTIS automatically disabled on tracked tractors - New translations: DE, FR, ES, IT, PL, RU (plus EN, PT, BR) with google, errors are expected!!! TESTED TOGETHER (no conflicts) - Precision Farming 1.5.1.0 - Soil Draft Physics (beta) – optional; when installed, CTIS tyre pressure is calculated from the real axle load - Realistic Mechanical Systems (RMS) 0.10.0.0 - Realistic Weather 1.2.0.0 - Fendt 1000 Vario Series, John Deere 8R Pack / 6R Large / Ripper 2100, Case IH Magnum CVX, Kubota M7, JCB Fastrac 4000, CLAAS Lexion 8000 - Real Three Point Attacher, Remove Frontloader Axle Locking, Vehicle Speed Sync, DashboardLive, Real Vehicle Cams, Universal Autoload - Maps: Riverbend Springs, Redstone County NOT RECOMMENDED TOGETHER (they also change wheels/differentials) - Mud System Physics, REA Plus, Tractor Terrain Dynamics, Variable Tire Pressure - EnhancedVehicle: turn off its differential/drive-mode functions if you use both
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 4x4 engaged: 25 km/h (tractors/harvesters), 40 km/h (trucks/cars). - No mode engages 4x4 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 4x4 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).
Multiplayer in development, playable but may contain bugs Compatibility tested with the MudSystemPhysics and Tractor Terrain Dynamics mods Behaviour fixes: Continuous-track tractors (only 2 tracks, e.g. John Deere 8RT, Fendt Vario MT) are no longer affected by the 2WD/4WD system — it makes no mechanical sense for them. Fixed the actual difference between "semiauto" and "auto" modes: semiauto now only engages automatically and never disengages automatically (this is always left to the player). Terrain anticipation GPS now always reads, even above road speed (previously it always stayed at 0% in this situation). Fixed implement mass reading (it was reading tonnes as if they were kg — underestimating the actual weight by 1000x). Fixed false triggering of "smart" mode when braking and shifting into reverse. Fixed being "stuck to the ground" when lowering a heavy implement (differential lock reacted too quickly to the initial spike). Automatic system (semiauto/auto) now reacts much faster to real and sustained wheel slip — previously it could take dozens of seconds. Fixed rapidly switching between 2WD/4WD when stopped in the field. Fixed false triggering of semiauto when starting from a standstill (a normal and brief wheel-slip spike at the moment of take-off). The "smart" mode (Fendt) has been isolated from the binary engagement logic — preventing interference between the smart mode's own hysteresis and the new detections. New features: Detection of "fieldwork in progress" (via the game's native GPS) and automatic "arming": when stationary/almost stationary in a field with the implement lowered for more than 2 seconds, 4WD engages directly. Experimental support for engine load as an additional signal (disabled by default, available in DriveModeConfig.lua). Features from previous versions (already included in this version): Proprietary GPS/terrain-elevation anticipation system, without depending on another mod — only on each brand's top-of-the-range tractors (Fendt VarioGuide, John Deere JDLink, Case AFS Connect, New Holland IntelliSteer, Deutz-Fahr Agrosky, CLAAS EASY) Proper 4WD terminal (Ctrl+Shift+G) — Status/Telemetry/Settings tabs, with wheel-slip thresholds and anticipation strength adjustable live, per vehicle Per-tractor telemetry (total hours, hours in 4WD, hours with differential locked, number of engagements, distance in 4WD, GPS anticipations) — saved in the savegame, with a reset button Savegame persistence of the 4WD state (engaged/differential locked) and adjusted Settings Renewed HUD — capsule-style bars with glow, pulsing halo on active elements, without text overlap Fix for the tyre-pressure conflict with FS25_MudSystemPhysics Extended support for brands/models: John Deere 6R/8R/9RX, New Holland T8/T8000, Deutz-Fahr Series 7/8, CLAAS Xerion, McCormick X8 VT-Drive
MULTIPLAYER (tested on a real dedicated server): - Differential detection on dedicated servers fixed; it previously always failed on the client side - Toggling 4x4 (Ctrl+J) now synchronizes correctly between the server and clients - Manual differential lock (Ctrl+K) now synchronizes correctly between the server and clients - Automatic modes (auto/semiauto/smart) are calculated by the server and synchronized with all clients - A player joining in the middle of a session immediately receives the correct state of every vehicle REALISM: - Ctrl+K (manual differential lock) respects a speed limit for engagement—it only locks when stationary or moving slowly, just like in a real transfer case GENERAL: - Internal diagnostic code removed - Documentation and store description reorganized
Fendt Vario Grip Smart unchanged for now. looking more details how it works New Features Automatic differential lock In "Auto" and "Smart" drive modes, the center differential lock now engages and disengages by itself under severe wheel slip, at low speed only (never on the road). "Semi-Automatic" and "Manual" modes still require Ctrl+K. Shop upgrade: Semi-Automatic → Automatic Tractors configured as "Semi-Automatic" now show a new configuration option in the store's Customize screen, letting you pay to upgrade that specific unit to full "Automatic" behavior (automatic diff lock included). This was added because many players didn't realize Semi-Automatic and Automatic tractors behave differently — the option is now labeled clearly: Semi-Automatic (Diff Lock Manual) — free, default Automatic (Diff Lock Automatic) — paid upgrade Known Issues there are several things that may need a tweak or fix. not all vehicles have real or near real specs this was not tested in deept with other mods including mod tractors or maintenance scripts except my maintenance mod, so compatibility not full confirmed with other mods yet Fixes Excluded 3 grape harvesters with independent hydraulic wheel motors (ERO Grapeliner Series 7000, New Holland Braud 9070L, Gregoire GL) — these vehicles are always all-wheel-drive by design (four independent hydraulic motors, no mechanical differential to switch), so the mod no longer applies to them as well as to crowlers and tracked vehicles. Crawlers and tracked vehicles no longer get 4x4 system Documentation Clarified the real difference between "Semi-Automatic" and "Automatic" modes in the in-game HUD hints, configuration comments, and readme: both engage/disengage the 4x4 itself automatically based on real wheel slip — the actual difference is that only "Automatic" (and "Smart") also lock the differential automatically. Compatibility Singleplayer only. No changes to save-game compatibility — existing installs can update directly.
Keybinds changed to Shift+Ctrl+J/K/N to avoid conflicts with other mods Auto/semi-auto response is much faster (confirm delay cut from 2.5s to 0.9s) The 2WD↔4WD switch in manual/semi-auto/auto is now a short smooth ramp instead of an instant on/off — no more jolt or momentary speed loss when the front axle engages under load Optional soft compatibility with Hyper Realistic Maintenance 2, if you also run it (see below) — fully standalone otherwise