xterraracer

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If you look at the picture you see that the housing is closed. That you have to remove the ring gear and then you can split the case to get at the spiders. On the the 2 spider diff, it has a large opening on both sides. That allows you to see the spiders, cross shaft etc. On the 4 spider diff, the case has to be closed so the other 2 shafts have material to be mounted into. The difference is so plain that once you understand it you too can tell at a glance.
Perhaps the next time you crack open one of the 4-spider diff cases you could snap a few pics so we can all see what the innards look like.