Really, it depends on size and weight. The shipping companies use whichever is more money to them.
I'll add a toploader "what is it worth" question. I've got a small input/output toploader that has been modified by Liberty to be a drag only tranny. It's a 2.78 low tranny. I traded a perfectly good Boss 351 toploader, c/i bellhousing, original shifter and linkage, stock flywheel, pressure plate, clutch, mount, and a couple of other Hurst
snap in shifters for it from a member. I'm not going to need it now as I was going to put my race 289 in my '63 Fairlane, but now I'm going FE power and will need a Jerico (even David Kee says I will). I plan on keeping my scattershield, aluminum flywheel, and Mr. Gasket Vert-i-gate, so it's just the tranny I really don't need. The guy I got it off of only put about 30 miles on it in his street car and found he just couldn't drive it on the street, the guy he got it off of had it freshly built. It's just been sitting in my garage. David didn't seem interested in it and really wouldn't give me more than a "its worth what somebody will pay for it" sort of an answer (not his exact words, despite the quotes). I've been kicking around Ebaying it.