[BILT4ME]

Yes, you have an open differential.

The Yoke turning does not apply because either one wheel will turn or both will turn or one will turn faster and one slower than the other, ASSUMING both wheels are off the ground. The yoke turns the pinion and the wheels will turn based on the RESISTANCE in the bearings, brakes, or tire friction. If you HOLD one tire, THEN turn the yoke and you cannot turn the yoke, THEN you MAY have a limited slip (actual POSI traction units are few....most are limited slip)

The MOST sure way without pulling a cover is to try to spin one wheel.
***If the yoke turns, and the other wheel does not spin, you have an open differential.
***If the yoke doesn't turn AND opposite wheel spins the opposite direction, you have an open differential.
***If the yoke doesn't turn AND the other wheel doesn't spin, you MAY have a limited slip.
***If the yoke turns AND the opposite wheel spins the SAME direction, you MAY have a limited slip.

Clear as mud?

Then you get into the differences between locking differentials VS limited slip. That's another thread. If you want to understand the differences, check out the website for Eaton Differentials and compare Detroit Locker, Eaton Limited Slip, True Trac, Lunchbox Lockers, Trac-Lok, ARB Air Lockers, Harrop E-Lockers, and others.