John,If you just send the box and not the bell housing, I’ll bet it is about $50 each way via FedEx ground or UPS. Call it $120 to cover a nice double layer cardboard box, and it’s still only 1/30th the cost of the transmission.
John
I will definitely not ship any heavy, delicate items in a cardboard box. Have learned the hard way (just ask @HB Chris and @TedS ). However, the plastic tub that @Markos shows is a good solution, I think. That is how I received a rear diff from a forum member. I'd make sure there is a LOT of foam packing the case such that the shaft will never make contact with the tub. My new ethos is to try and pack it such that if you dropped the entire thing from about 10 feet in the air onto a concrete floor it would be unharmed. If it passes that test, it MIGHT just make it.