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...On a related note, it looks like the switches are on top of the t-case and difficult to get to. Is this the sort of thing where I can remove the rear driveshaft, remove the t-case crossmember and lower the case enough to get the switches in and out?

I haven't done this, but others have said that this is exactly how they've changed out the switches. Good luck, and please follow up with what you discovered!

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