Editing Differential FAQ (section)

==What L.S.D centers are available?==
The R31 came with the optional BW78 Cone type L.S.D: 28 spline, 4 pinion. 


This diff is very effective for providing limited slip in slippery conditions, however the design does not lend itself to durability. Many users experience a loss in the locking ability of this center between 3 months and 1 year of regular hard usage. These centers can be rebuilt (reshimmed) but will have a similar lifespan. 


Most L.S.D centers that you will find out of other BW78 cars will be based on this design. 


They are available in the following configurations: 
* 25 spline, 2 pinion (Ford Falcon - XD, XE, XF. Holden Commodore - VL)
* 28 spine, 4 pinion (Ford Falcon. Holden Commodore - VL turbo, VL V8, VN onwards)


KAAZ diff centers are available for the BW78, and is quite possibly the best aftermarket L.S.D available. They are a much better design, based on clutch packs, rather than cones.


The most available KAAZ center is what is know as a 2 way diff, which applies lock under both acceleration and deceleration.


The following video demonstrates the difference between a 1.5 way and a 2 way LSD: [http://www.youtube.com/watch?v=who5AG3MjNQ YouTube]


Available in 28 spline, 4 pinion

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Eaton does a Torsen based center for the BW78, it is a very sturdy design. Its based on another set of gears inside the center, which under slip, adds torque to the wheel that has more grip, based on a multiplication factor. The Eaton/Harrop branded 'Truetrac' center as mentioned above, is very strong and should be used in high power applications.


You will also find a 'Mace' branded Torsen center, that cost around the $600 mark. These are not for high power applications. These centers have been designed as a cost effective/longer lasting replacement for the 'cone' type LSD as fitted standard. That said, these Mace LSD centers are only designed to hold stock engine output power, and work fine in this duty (but can shatter the case in high power usage).

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