The Jatto 4N71B was released after the last of the B310 cars were made I believe & when I can I plan to fit one to an A15 & use them in my 1200 coupe.

They were used in a number of cars, including Skyline models & some Commodores, but I intend to use one from a 4 cylinder Pintara. These did not have the lock-up converter feature & this simplifies the instalation quite a bit as far as I can tell.
I have every reason to believe that the trans case will bolt to an A series bellhousing & use the A series torque converter, but I have not put that to the test yet.

The trans is basically a three speed with a selectable overdrive, so the advantage that it offers is in the 'highway cruising' end of the performance spectrum.

The bellhousing of a 3n71b will bolt straight
up to a 4n71b overdrive trans definatley. It
would not matter which car it came out of
because you would have to have a
converter custom made anyway. Lock up is
not as scarry as people think and for a
highway cruiser it is an advantage, it will offer
a "deeper" overdrive and eliminates slip in the
converter with a mechanical instead of fluid
coupling therefore reducing friction and heat.
overdrive would be a manually operated
switch on the dash to energize the solenoid
and a lock up switch would be no different.
For strength a turbo vl commodore box would be ideal,
hope this helps

Peter Gilroy Automatics in Toowoomba Best I know when it comes to JATCO boxes it's worth the call.

I've met guys who've said the auto's are farking tough. BUT they are a bit heavier too.
The best way to operate the overdrive switch is to have a dipswitch like valiants and the lke used to use on the floor. Then when you run out of revs you just kick the dipswitch, and your in angel gear. My dad did this when he put an LD28 in his old XD work hack. It was kinda cool, like a manual kick down for overtaking on the open road.

All this talk has almost got me wanting one. Does anyone have the actual weight figures for them? My 63A box is a monster bit of kit already. (Comparable to a 56 four speed)