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What is the main difference between these two Quafie LSD's?
From what I read the Early one needs some sort of mods to the crown wheel and maybe some other bits and pieces...is this correct?
The "early" ones use LSD CrownWheels - which have a much bigger diameter hole in centre of the crownwheel. And yes - require LSD output shafts, circlips etc ($$)
Diff housing may require some machining
eg
http://www.swiftune.com/Product/639/swiftune-crown-wheel-and-pinion-47.aspx
* and not all LSD Crownwheels fit (eg MiniSpares are a slightly different diameter by a few mm - Jack Knight ones do fit OK. It would probably be possible and easier to machine a few mill from the Quaiffe rather than the Crownwheel - but I just got a different crownwheel. )
The newer style just uses a standard crownwheel and "Pot joint" outputs.
eg
http://www.swiftune.com/Product/418/swiftune-crown-wheel-and-pinion-45.aspx
Functionally I believe they are otherwise identical....