forgot how to test if the box has a lsd, i had a ib5 box installed the other week and asked them to include the lsd in the ib5 box

is there a way of testing with both wheels jacked up and turning one and the other side turns aswell

i engaged 1st gear, jacked up, and turned the passengers side wheel and the drivers side did turn aswell, but not in netruel,

have i been ripped off?