ROBERTSUNRUS wrote:
a simple basic way of telling if you have a locking differential or not. With a locking differential both rear wheels will turn in the same direction.
This works only if the driveshaft is free to spin. If the transmission is in park (auto) or in gear (manual) an open diff will spin the other wheel the opposite direction. A locking diff will spin the other wheel the opposite direction too except it will be harder to spin since you have to overcome the internal clutch.
With the driveshaft free the open diff will spin the other wheel opposite while the driveshaft remains stationery. A locker will usually spin the other wheel the same direction and turn the driveshaft at the same time.
I say usually because the condition of the diff and the freeness of the driveshaft to spin have a lot to do with the outcome of this test.