Fully drain (overnight is best) transmissions and final drives, and then re-install drain plugs before packing.
Ship your components for repair to:
1503 6th Street SE
Charlottesville, VA 22902
attn: [your name]
Enclose a note with your contact information, a summary of the repair needed, and the address to which your package should be returned.
You need to be VERY careful when packing transmissions and similar items. You have to assume that the package will be thrown considerable distance no matter which carrier you use. A box within a box is the best way to go. Make sure that the contents are not loose within the box or they will make their way through the wall eventually.
Cylinder heads should be individually wrapped, taped, and then bound together so they don't bang edges against each other during handling.
It's easy to underestimate the requirements for packaging heavy items like transmissions, cylinder heads and final drives. Unfortunately these are expensive items and there are real consequences to you when an empty box with a hole in the side arrives at my shop.
This package is basically perfect. The transmission is clean and wrapped in plastic so that any oil that leaks out won't stain the box. Many shippers will not deliver a box that's leaking fluid.
The wrapped transmission is tightly packed into the inner box. The reason you see so much packing on one side is that the mounting flange is much longer than the body; the flange is under the fives sheets of pink material.
The inner box is securely packed into the outer box. The reason two boxes are used is that the extra wall provides support for the inner packaging. Sharp blows top the package bear on the inner wall, which is cushioned against the outer wall by the second layer of packing material. Additionally, if the outer box gets torn the contents are still fully contained.
It's very important to immobilize the contents in their packaging. Styrofoam peanuts and paper are not that useful, as the object will migrate through. The best way to pack items like final drives and cylinder heads is to wrap in bubble-wrap and tape it like a football. That should go into a box, which is preferably wrapped in another layer of packaging and put into another box.
You have to assume that your package will be thrown. If you don't feel comfortable throwing the package down your driveway, it's not packaged well enough.
Tip: When shipping Airhead gearboxes, always screw in the breather bolt (where the negative cable attaches to the gearbox). It's a weak area and often that hole is no longer round when I receive a gearbox from UPS. Installing the bolt there allows that corner of the gearbox to take a hit without crushing the threaded hole. -Ted Porter