Like sg5054 said,
when I had my transmission shipped the guy put it on one of those small pallets & used some heater hanger strap (from HD or Lowes, or ACE), & use some drywall screws & screw it down solid to the pallet. he even took some cardboard & staple gunned it to the pallet to make it look like a box & to cover the trans. looked *****en & worked great.
Bob