Shipping 8.75 chuck?

if you pay the ups store for packing service, THEY are responsible for that.
ups claims that "the ups store" is a seperate company, (actually mail boxes etc.) but you can file a claim with the ups store for poor packaging and let them fight it out with ups. since ups rates are based on weight and size and distance, the smaller the bucket the better rate-wise. i think a 12 gal bucket is overkill.
a 5 gal should suffice. even better than plywood would be cardboard, especially if you can get some double or triple thick corrugated cardboard. i have shipped engines in triple thick cardboard boxes without problems. if you put several layers in the bottom, cut a long strip or two and wrap it continously around the sides, so that the chunk fits snug inside it, then a few layers on top of it, then the lid. snap on or screw top lid should be ok, just duct tape it to secure it so it can't work loose. Doug

The problem with a 5 gal bucket is that a complete 3rd with the yoke and carrier ,gears. Won't fit, there to tall.