larger or smaller speedo gear needed?
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You need a smaller tooth gear when going up in size since you need to spin the gear faster to compensate. Since you're running 265s best thing I can say would be to stop at a Ford dealer. 265/70/17s where a factory size tire and is the same overall size as what you have. They will be able to tell you exactly what gear it takes to make it read right.
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The VSS gear is a small gear clipped on the end of the transmission/transfer case (4x2/4x4) VSS sensor. The sensor is held in by 1 bolt. Pull that and the clip pops off the gear. Total time to change the gear is about 5 min, most of which is actually getting the tools out. The sensor is on the tailshaft on the drivers side. You will see a large wire going to it and is very easy to spot.
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#8
If your dealer is anything like the ones around here their tables only cover stock setups. Since the F150 was never offered with 4.10 gears or 33s then they might not be much help. I'm trying to remember the way to figure out what tooth you need after a gear and tire change, but its escaping me at the moment. Without the gears its a somewhat simple calculation, but right now I just can't recall how to work the gear ratio in there.