diff looks great, im in SA to may i ask who did it and how much? also RE the speedo drive the one to use is off a r31 pintara manual they have the same red cog as the sr one, i got mine from upullit $4
also if you havent sorted your clutch set up i started a thread with some good info that may be of use to you
http://www.ozdat.com/forum/viewtopic.php?f=29&t=20035