What he said. I understand MR Automotive have started making Maxidrive lockers which are also an option.
Link to MR Automotive here
The advantages of MD:
- Locker comes with upgraded halfshafts (integral to the locking mechanism),
- Doesn't require a separate air source (works off the
vacuum pump)
- MD lockers have a reputation for being (almost) indestructable.
- The actuator mechanism is not preloaded, so if you lose
vacuum with a locked axle, it will stay locked. This can be a disadvantage as well, as you may have to unlock it manually. I've heard it can be "sucked" back into unlocked position but have not had first hand experience, you can use compressed air at low pressure (e.g tyre air) to do the same, or dismantle the actuator and unlock it manually.
The disadvantages:
- Installation requires welding on the axle casing to mount the actuator - shiny cylinder in pic below (exxy if you can't do yourself - approx 10 hours labour),
- Can be a bit slow to engage (actuator works off 15 psi
vacuum, versus 90 psi compressed air for Airleakers). Not much of an issue for a rear locker IME.
I have MD lockers front and rear, and to be honest, I seldom have the need to use them in anger, primarily due to my tame driving.

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