A crate like the one pictured can work for UPS or Fedex but there is still risk. For UPS and Fedex, there is no such thing as the top or bottom of a package. During shipment, every package is on and off a minimum of 3 trucks (or a rail car) and any which end or side may be up or down during that time and heavy stuff gets dropped, tossed, rolled and placed at the bottom of trucks with hundreds of pounds of other packages on top. Oh, and if you insure your transmission and it's damaged in shipment by either of these companies, forget about getting your claim paid. They don't give a rats ass about your stuff or your problem and no matter how you pack it the claims folks will tell you it was "insufficient".
With a truck shipment you have a better chance of the transmission staying upright but these folks are paid to fill trucks top to bottom so if you think your transmission is sitting on a pallet on the floor of the truck with nothing on top, you might be in for a surprise. More likely it will be teetering atop a pallet of something else. That and the claims departments of the LTL carriers are not actually staffed. Your faxed claim form is received by a fax machine which hasn't had any paper or toner in it for years.
I like the crate approach regardless of how it's shipped. Protect yourself. Nobody else gives a shyt.
correct on all accounts! And Funny. I never even bother with claims either.. waste of time