rear end dilema

[Siral3x]

I replaced the fluid in my rear end the other day in my 90 gsx...wow...looked to me that was never changed.
My rear end has a old sticker on it...something B'x?' version LSD , JAPAN?
Does that mean my car has a LSD??
I was thinking of doing a 4 bolt swap but the 4 bolt is not LSD..so I'm just going to wait till latter to so the swap.
What do you guys think??

 

[99redgst]

Jack up the rear end and spin one of the rear wheels by hand. If the other wheel spins the same direction it has LSD, if it spins the oppisite direction it is an open diff.

 

[Siral3x]

yupp...it does spin in the same direction at the same time..I remember doing it a while back..so huh..well..I guess I"ll stick with the original rear end and upgrade later to a 4 bolt.