Käykö Supra Mkiv 6 spd torsen soareriin?
http://alscforum.com/discus/messages/117/297.html?1178075163
YES - The non-turbo JZA80 Supra (SZ) diff (for auto or 5 speed manual) is identical to the TT Soarer 5 speed diff which has a 4.083:1 ratio. This ratio is labelled as 01 for Supras so a compatible Supra Torsen diff is an A01B.
MAYBE - Auto TT JZA80 (RZ) diff. This has a ratio of 3.769:1 so is taller than the standard V8 Soarer diff but if you're going for forced induction (supercharging or turbo charging) the extra engine torque may warrant a taller final drive. If you find a Torsen diff but the ratio is not what you want, you can always have a diff/gearbox specialist swap the pinion and ring gear with your existing diff.
NO - The diff from the 6 speed JZA80 Supra (RZ) is NOT a bolt in option. Firstly, there is a huge gearing difference as the 6 speed supra diff has a 3.2 ratio so would be far too tall to use with a Soarer gearbox. However, if the V160 6 speed gearbox is going in then this diff should be fitted too but if that's the case extensive work will be required anyway.
Secondly, it's physically too big. Below left is a B-series 6 speed Supra diff that has a larger ring gear and a Soarer diff on the right. It is so big the Supra has 1 drive shaft shorter than the other because it is offset to the side. Here you can see how much wider the Supra diff is compared to a Soarer diff.