I swop mine around as the outdrives wear out to keep the wear equal each side. It doesnt matter which way its installed. You shouldnt need to try it to feel if its slipping. The bench test will tell you if its not too far off. The slipper plates should spin when you apply moderate pressure turning the right rear wheel forward. If its really difficult to turn, the slipper is too tight. If the plates spin freely then you need to tighten the slipper or else you may melt the spur gear first run. The diff action should still be smooth.
Its easy to do, not so easy to explain. You`ll probably need to fine tune the slipper for the surface you are racing on but the bench test gets it 90% right before you put the car down.
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