this is the diff for my dutton project, ive opened it up its a 9" from a chevy c10 truck 1978, if i turn either wheel forward the other wheel either stays still or turns in the same direction which im assuming means its not an open diff ? am i right in thinking with an open diff that the wheels will turn in opposite directions when wheels are turned of the ground ?

im not sure wether welding up all the planet gears will make it solid locked or if it will still possibly slip on an lsd ?