everyone with a 240sx should learn on open diff before doing anything.
this alone will teach you more about your car in a less amount of time!!

learn how to link turns on an open diff.
this sounds alot harder than it really is.
the recipe' is as follows:

1. large balls.
2. go just a little bit faster than you feel comfortable.
3. then weight transfer the car extremely hard.
4. and grab a whole handful of E-brake
5. then the magic happens.
6. takeyour right foot &pin the pedal farthest to the right against the floor!
7. you want to press hard enough that you can support you body weight.
8. then if you're still having problems,modulate angle with the clutch pedal!!

Thats it, that's all you need to successfully link Desoto's infield with an underpowered KA

also, for really low powered cars like KA's a welded diff will help more than a stock LSD.

stock LSD's don't work that well after some miles. I put one in my white KA car, and it feels like an open diff.

the welded also helps with keeping the traction broken on both tires. if you don't have a million horse power, its usually alot harder to break the traction in the first place, so keeping the inertia of the rear wheels going is of upmost importance..