It's not a Quaife, but a Torsen. Both are brands of gear-based torque-sensing differentials. Torsen is the American company that developed it, Quaife is a British company that uses the same principle. Both Quaife and Torsen have served as OEM suppliers of differentials to various carmakers. Torsen was the OEM for Alfa.
The Torsen differential was first used in the 147 Q2 and other models with the C.530 6-speed transaxle, but it also fits in the 5-speed C.503 transaxle of the 164 with some modification to the speedometer gear. The Q2 was introduced in 2007, not 1997 as indicated in the link you provided. You can read more about the Q2 diff. in the 164 forum on alfabb.com. The Q2 Torsen diff was only used for a few years. Currently, Alfa uses "Q2" as as a marketing term for an electronic limited slip system on a car with two driven wheels. Here's a post by the owner of the car on the alfabb: http://www.alfabb.com/bb/forums/164-168-1991-1995/48153-my-164-quadrifolio-just-like-she-left-factory.html Cheers, Sonny '91 164 S with Viscodrive LSD Baltimore >Date: Wed, 16 Mar 2011 20:51:06 -0400 >From: Joe Elliott <[email protected]> >Subject: [alfa] Factory Quaife LSD retrofit for 164? > >http://bringatrailer.com/2011/03/13/bat-exclusive-1994-alfa-romeo-164-quadrifoglio/ > >How come I've never heard of this? Can you really put the >differential from a newer Alfa into a 164 transaxle? > >- -Joe -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected]
