SBN2645 at £850 - for 300zx and other nissans
SBN3510-01 at £1,200 - for 350z with the original VLSD fitted (GT models)
SBN3510-02 at £1,200 - same as above but is the SQ super quiet version
SBN3515-01 at £1,200 - for the 350z with the original open diff (None GT models)
SBN3515-02 at £1,400 - same as above but the SQ super quiet version
you can check if you have a VLSD vs an open diff by lifting the rear of the car and spinning a tyre, VSLD both wheels turn the same direction - open diff each wheel spins in opposite direction.
hope that helps I just recently changed my diff for the Quaife helical torque biasing diff.
Hardest part was removing the ring gear, impact driver wasn’t man enough as the screwing are loctite’d in.
solution shown in the images, screw one of the axles to a piece of wood, wedge wood between two walls. Make longest lever arm as possible and then push with all your power.. worked for me and had the worm gear off in no time
Ps the oil was disgusting smelling, my MRS wasn’t happy stinking out my dinning area but oh well.