diff interchangeability, Quaife/A4/4kq/540i?

Mihnea Cotet mik at info.fundp.ac.be
Sat Jan 12 08:17:49 EST 2002

At 22:16 11/01/2002 -0700, auditude at neta.com wrote:
>Hey all,
>Check this out.  It looks like the Quaife part number for the rear A4
>quattro diff is the same as the front 4kq part number.  As a matter
>of the fact, the same part number is listed for a BMW 540i
>Does that mean these tranny's (and that diff) use the same exact
>part?  If so, what swapping opportunities does that provide?  What
>type of diff is the stock A4 rear?  The BMW tranny?

I may be wrong but these seem to be front diffs and the Audi P/N is
40.309.170 while the Bimmer part is 30.309.170.... maybe they could be used
instead of each other, dunno though, but it looks like you didn't read


'85 -OOOO- Coupe quattro


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