Hold the spur gear and the left wheel still (if you've got a slipper clutch tighten that up all the way). Then try to rotate the right wheel. If you can the diff is slipping, if you can't then it's not!
I've found the best way to set your diff after a rebuild is to run it in first by holding one wheel for 30 seconds while using 1/4 throttle on the TX. The hold the other for another 30 seconds then tighten the diff a little. Repeat until the diff is locked whilst smooth. 2 of each should do it. Remember not to overtighten at the start of the process it's best to start with a loose diff first.
If you want the balls to grip on the plates better 'key' the plates by carefully sanding them with some 1000 grade wet&dry paper.
HiH
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