I have a 94 Nissan Altima GXE with Automatic Transmission. The transmission is shot & I am looking around for a used one to be able to put in it. However the one question keeps coming up & thats if its a locking or non-locking differential. Does this car even have a differential being a front-wheel drive? If so how can I determine if its locking or non-locking, that way I can get the right transmission?

you have a non-locking diff.