Limited-slip differential (LSD)
Also called: LSD
A limited-slip differential automatically biases power toward the wheel with more grip, smoothing out traction without ever fully locking the axle.
How it works
A middle ground between an open and a locked differential. It automatically biases torque toward the wheel with grip, using clutches or gears, without ever fully locking the axle.
When to use it
Continuous, mild traction help — including at road speed. Smoother than a locker.
Pros and cons
Pros
- Automatic — no driver action
- Works at speed
- Smoother than a locker
Cons
- Less absolute traction than a full lock
- Can wear over time
- Uncommon as factory fitment on kei trucks
Compared to other systems
Against a diff lock: smoother and automatic, but with less ultimate traction when a wheel is fully unloaded.
The quiet, automatic alternative most kei truck buyers will never need to think about
A limited-slip differential rarely gets the attention a diff lock does, and on kei trucks that is mostly because it is uncommon as factory equipment in the first place. Where it does appear — or where an owner has retrofitted one — it offers a genuinely different kind of help: instead of a hard, switch-operated lock that you must remember to engage and disengage, an LSD biases power toward the grippier wheel automatically, smoothly, and at any speed, including on the road.
The trade-off is that it never reaches the absolute, guaranteed traction of a fully locked axle — if a wheel is completely unloaded, an LSD can still struggle where a true locker would not. For the kind of occasional slippery-driveway-and-wet-field use most kei truck owners actually encounter, that smoother, automatic middle ground is often exactly enough, and it asks nothing of the driver in return.
Models with this drivetrain
Trim-level mappings for this drivetrain are still being verified — confirmed models will appear here once the data is checked against factory spec sheets.