Sorry to hear of your problem. Yes take it back BUT find out what the "rebuild" was? Was it new bearings, thrust washers, syncro cones etc OR was it worn gears also. Anything else that was done?
You should have this on the invoice but I suspect it is not the case.
Good luck.
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Why is it so? Professor Julius Sumner Miller, a profound influence on my life, who explained science to us on TV in the 60's.