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Visitors:
When I got the truck, I had to lock/unlock the hubs with pliers because it was too difficult to turn by hand.  I figured a hub rebuild was in order.  There are several excellent write ups on the internet for Toyota Aisin hubs.  Here are some links:

Pirate4x4.com

4x4Wire.com

Off-Road.com

After following procedures from the above links, my hub dial now turns freely with ease.  When I disassembled my hubs, they were bone dry and there was lots of surface rust.  I cleaned everything up and applied a light coat of grease.  Here is what they looked like

Nice rust on the inside which was making the dial hard to turn

More rusty surfaces

All covered in rust

Did I mention the rust?