[Formulajones]

Originally Posted by grivera

Funny story - just called a local driveline shop to discuss options. Owner says, "That isn't a lot of horsepower - 1310s won't break." He offered to make a thicker walled 3" driveshaft with "high quality" 1310s...

Well there ya go.

Along those same lines, 2 cars here that are (or were at the time) making around 600 hp/tq, and weighing 4000 lbs. (one weighed 4108 with me in it) both ran mid 11's with the stock "original" shafts and greaseable u-joints in both cars for years.

You can figure your bird is quite a bit lighter than that, and a lighter car is certainly easier on parts.

Just to add, what I've seen break more often than u-joints are the cast yokes.