Mort

The part numbers you are seeing on the pumpkin are likely for that individual part itself while the part numbers to order the differential are likely for all the parts that are used to make it a complete unit. The only way to be 100% sure it is a locking differential is to unbolt the rear cover and have a look.

skratch77

Would an open diff spin both sides without any load on them? I rather not tear it apart to confirm and you are right,every piece has a part number on it.

When I turn the input both axels turn in the same direction but I'm not sure if an open diff would do the same without any load on them.

Jasonoff

Yes, you'd need to spin the axle spline to tell.