Realistic 4×4 Traction System V2.0.0.1

Multiplayer is in development. The mod is playable but may contain bugs.

This mod adds a switchable 4×4 traction system to compatible tractors, trucks, harvesters and cars, with front-axle engagement, differential locks and wheel-slip-based operation.

Features

• Real rear-wheel slip detection, with automatic modes reacting 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 remains available.
  • Automatic, using the same logic adjusted for vehicles with factory-fitted automatic 4WD and CVT/IVT transmissions.
  • Intelligent, with continuous proportional engagement in the Fendt style, without abrupt switching on or off.
• Native tyre-pressure simulation during engagement, with 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.

V2.0.0.1

• Fixed a Lua error repeating in the log, FourWDTractionSystem.lua:2518: invalid argument #3 to 'format', on vehicles with permanent 4×4 or without a 4×4 speed limit, including 6×4 trucks, wheel loaders and articulated tractors.

V2.0.0.0

• All drivable vehicles are now supported, except trains, boats and motorbikes.
• Each vehicle is recognised by its shop category and its real driveline:
  • Tractors: selectable 4×4, as before.
  • Articulated and 4-track tractors, wheel loaders and telehandlers: permanent 4×4, locks only.
  • 6×4 trucks: lockable inter-axle differential and locks.
  • AWD trucks: selectable front drive.
  • 4×2 trucks: rear lock.
  • Cars, pick-ups and UTVs: part-time 4×4 that engages on the move.
  • Combines and self-propelled vehicles: rear-axle drive on demand.
• Limits per vehicle type determine when 4×4 and locks can engage, the top speed with 4×4, and automatic lock or unlock.
• New 4×4 window, opened with Left Alt + J, with a top view of the driveline, 4×4, centre or inter-axle and front or rear locks controlled with the mouse, mode per vehicle saved with the savegame, tyre pressure settings for field, road, automatic and manual operation, telemetry and all settings.
• The menu in the game’s settings was removed because it slowed down loading. Everything is now in the window.
• Mod and DLC tractors without a profile get their mode from the transmission: CVT or full powershift is automatic, partial powershift is semi-automatic, and manual gearbox is manual.
• Brand profiles now apply to tractors only. Massey Ferguson combines and the Kubota R640 were set to automatic. Challenger MT600 is excluded.
• Zasty HUD: with the HUD active, the 4×4 panel hides and the HUD shows 6X4, AWD, 4X2 and the locks.
• Multiplayer: the driveline and mode of each vehicle reach all players, and the chosen mode is checked on the server.
• Keys: only Ctrl + J for 4×4 and Ctrl + K for locks remain. Single locks, CTIS, tyre pressure, panel and telemetry moved to the window.
• Fixed the default keys not being assigned on a new installation.

KEYS (default)

• Left Ctrl + J: 4×4 on or off.
• Left Ctrl + K: Differential locks on or off.
• Left Alt + J: 4×4 window for locks, tyre pressure, mode and settings.

These are the default keys. If one of them is already used by the game or by another mod, go to Options > Controls and set the key you prefer to avoid conflicts.

V1.7.0.1

• AI helper: the combine could stand still reversing uphill and would not shift gear. The 4×4 now only works on the vehicle driven by a player. With an AI helper, stopped with nobody inside or parked, the vehicle uses the game’s original differentials, tyre radius and speed limit.
• Added the missing translation for Move 4WD HUD, which caused a log warning in 22 languages.
• HUD textures were compressed, so there are no more raw format warnings in the log.
• Game start is faster. The settings menu section is now built only the first time you open Settings, which previously froze the start by ~4 s.
• Added Vehicle Control Addon (VCA) compatibility. VCA has its own 4WD and diff locks and rewrites the differentials every frame, so both mods were fighting.
• New option in Settings > General > 4×4 Traction System > With Vehicle Control Addon:
  • Command VCA (default): the mod’s automatic 4WD logic, including slip, implement lowered, braking, tight turns and GPS prediction, switches VCA’s 4WD and diff locks. VCA handles the differentials. CTIS, tyre pressure, HUD and telemetry keep working.
  • Leave to VCA: only VCA works on that vehicle.
  • Ignore VCA: old behaviour, not recommended.
• The VCA integration should work, but it has not been tested in-game yet with VCA installed.
• Checked with Headland Management and CVT Addon: no conflicts found.