Proper cribbing of a drivetrain for safe shipping is paramount concern ...none of us wants a newspaper headline to read "XYZ Corporation's Drivetrain Crushes Carload Of Unsuspecting Passengers". This is serious business, and improperly secured loads have in fact cratered roadways.
While the ultimate responsibility for the security of a drivetrain load belongs to the shipping company, it is definitely in the owner-operator's best interest to try to help to prevent such serious incidents. The pictures here are illustrative of what a properly secured load should look like and what kind of cribbing should be utilized, however, they only demonstrative, and the onus is upon the shipper and the owner-operator to evaluate what will truly secure the load. And PLEASE mandate that site personnel inspect the loading and tie-down to cross-check the work performed by the person(s) securing the load for proper tie-down and cribbing.
When gearboxes, mainshafts, or the whole assembly are purchased, they should arrive on engineered cribbing – if not, then you should work with your supplier to insure such components are properly secured and cribbed. And the reverse must also be true - components being shipped out for repair or exchange must be appropriately secured and cribbed. Inspect cribbing and only use if in good condition.
Please know that the shipper has the right to refuse a load if improperly cribbed.