Originally Posted by toyota4x4907
Factory TRD rear lockers didnt come out until 1998, anyhow.
I've got one on my 97, but you're right. 96 didn't have a diff lock. If it does have one it must be aftermarket.
If it's selectable then it has to have some kind of switch. It might be a ratcheting one. If it is you might be able to hear it if you turn really slow on pavement.