http://ozdat.com/forum/viewtopic.php?f=55&t=34746

H190 LSD unit from late 720 truck 29 spline - 680 aud
large pinion bearings.

2-way clutch type, that can have the plates stacked differently for more lock up.

Vehicles that used these 29-spline diffs:
S110 200SX '82-'83
S12 200SX '84 with CA20 engine
520/521 pickup*
620 pickup*
Some 720 4-cyl, 2 rwd pickups except the 1st production year.
D21 4-cyl, 2 rwd pickups
and maybe the early '80s Maxima wagon, if they have 29spline axles.
(*must use iron carrier from later vehicles)

These take the same internal parts as the Nismo R200 LSD

770aud posted anywhere in Oz

Pmd

Pmd answered

Also my 4.875 ring and pinion could possibly be up for sale
more suited to 6 speed for the street or 5 speed for track
Its a large pinion unit with alloy carrier which when fitted
is only 4kg heavier all up vs H165 diff centre w/ iron carrier

Sounds like the same ratio and alloy carrier combo as I have here D.
Thanks for sharing the info on the R200 LSD internals also! I never knew that.

No problems sounds like you are gathering the best stuff for you datto!

I had to research the spline count on the R200 and unfortunately are different
diameters with different splines as well but clutches can be used from R200
as there would be no profitable reason to make different sized clutches for
190-200 while H230 are larger.

s15 short nose R-200 helical- 30 spline
cedric/gloria R-200 helical - 29 spline
240sx short nose R-200 open- 29 spline
280z & zx long nose r-200 open- 29 spline
z31t long nose r-200 lsd- 29 spline
n/a z32 short nose r-200 open- 29 spline
z32tt R-230 lsd- 30 spline
90-96 Q45 short nose r-200 lsd - 30 spline
89 R32 GT-R CLSD R-200 - 30 spline
r30 skyline longnose R-200- 29 spline

There are supposedly 4 types of H190 alloy carriers

The ones we are interested are on post 1975 Nissans
which are all 29 splines as opposed to earlier imperial

Cast iron carriers are also all 29 spline and there are
about 3 different castings

Ive had one of my metric units used in Canada with later 29 spline
axles to an early roadster housing to get rid of the imperial
23 spline axles which are unobtanium.

The side gears can be easily swapped to use early H190 axles with a late H190 diff carrier or vice-versa. We have a write-up here with photos: H190#Side Gears

The 320 rear axle assembly (complete) is one inch narrower than the 1200 assembly, so is a useful swap