[55 Chevy Dave]

I also managed to get my custom aluminum driveshaft made. I was accused of giving them the wrong dimensions for the rear u-joint on the first shaft (which I did not do). Check out the third pic below - I don't think that's how they are supposed to fit!

I managed to get them to correct it and (3) 2-hour round trips later, I finally had a drive shaft that fit.

They didn't charge me any more for the mistake (that I did not make)!
I guess it's just part of the adventure that is a custom truck build, right?