Pretty sure they are balanced from the factory.

 

Change the orientation of the yoke while replacing a u-joint and it won't be, I've done that, once.

Edit, or just a tired u-joint....

 

Yes, they are.

 

Yes factory driveshafts are balanced and in all theory should be good for more rpm's then a V10 can spin it in overdrive? figured tire speed rating would've been brought up by now also. Lol

Just asking a stupid question, having fun.

99.99% of the time the truck in my sig pic just towes big stuff.

 

up there on post #8 I mentioned tire speed ratings.

Along those lines, I feel like tires deserve a speed rating but driveshafts don’t. obviously I’m wrong. But that’s how I feel

 

Z rated tires we're fun on my Mustang, didn't even throw the driveshaft at 150mph.

 

I should have mentioned that I don't have a lot of good questions because you all have answered them and I've found them with a Quick search, love this site. Sorry for horsing around.