Quote:
Originally Posted by andyh1956
Only turning one rear wheel will give an erroneous reading. The spider gear to side gear ratio will do that.
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Curious how the spider will change the reading? I do not believe it operates like a planetary gear set. I think you will find that the opposite wheel will tend to rotate in the other direction with an open diff and both wheels off the ground. That can lead to an "erroneous reading"