I do agree upgrading the axles is a good idea. But with that said I still have the stock axles in my 63. I mostly drive the car on the street but I race it 2 or 3 times a year. I had a 500 hp 440 in it running mid 11's since 2006 and put my 600 hp 493 in this year and have made 7 passes so far running in the 10.70 area with no trouble. But I am lucky so far as I am asking for trouble if I dont upgrade my axles real soon. I will have to get a price from Dr diff. But if you are not racing and not putting sticky tires on it you can drive around on the stock axles. But as was said it wont hurt at all to upgrade the axles.