Don't drive it across the border. Blow the money and ship it from Canada.
That's the sure way as you can identify the unit by serial # in the shipping docs which clearly show where it was picked up and where it was going. The docs will indicate that it's a ZF going for repair.
Take some pics and you should have no problem proving it came from here and went there for repair.
Your shipping docs will be clear plus you will have an invoice from the company you shipped it to confirming the repair that was done and the cost.
But shipping will cost much more. I guess you'll have to weight the risk of aggravation and/or extra charges at the border.
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