Would the C-V shafts from an impala fit
onto a grand am. These shafts are brand
new and still in the box????
Doubtful...if you were swapping with a Grand Prix, then yes, because it's the same chassis. The Grand Am is a more compact chassis than the Impala/Prix (W-body) chassis. Your CV axles will likely be too long. I would try to get either a refund or recoup something by selling the shafts on ebay, then go buy the correct CV axles for your car.
Search Chevrolet Impala Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Chevrolet Impala Experts