Syncro Vanagon Viscous Coupler Test

Testing the Viscous Coupler in my 91 Syncro Westy.. this is how you do the test using a 2x4 flat on a smooth floor. This is an example of how a good V.C. should work.
Slowly let out the clutch in low or G gear at idle. It should stay behind the 2X4. With a slight increase in revs, it should climb over the 2X4.