Corvettelvr73

what are the different sizes that they came with for big blocks and small block applications?

70PurpleLS7

I think they come in 2 sizes, 2.5" and 3". My 70 big block car had the 2.5" halfshafts. Seemed that the later C3's all came with 3".

Z-man

That's right, although the larger diameter shafts used thinner metal, so they weren't any stronger. There is an article in the new Corvette Fever (I think) magazine about a company now making 3.5 inch halfshafts that will also have the ability to house larger U-joints. Also, another after market company is making carbon fiber halfshafts that will handle up to 2000 hp! There is a picture of one somewhere on this forum...